Dometic 300 Toilet Smell Issue - DIY Repair - Step-By-Step Process

In this video, we will go over the step-by-step process of repairing the Dometic 300 toilet on my 2020 Keystone Bullet 243BHS. We did this after noticing a strong urine smell coming from a recently replaced toilet. Having previously replaced the toilet two times, we decided to take a different approach this time and disassembled the toilet and rebuilt it.
Dometic 300 Toilet Replacement: • 5 Tips for Black Tank ...
Step-By-Step Process Document: johnmarucci.co...
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[@marynadippenaar8889]

We have the same issue and are in the process of fixing the toilet. Please explain in layman's terms what causes this issue. Also, Please let me know if this fix has worked for you for 2 years since you posted the video. If its not a permanent fix, which toilet would you recommend in place of the Dometic 300?

[@JohnMarucci]

Let me answer your three questions in reverse. Dometic has a toilet (model 310) with a ceramic bowl that does not have the same issue as the model 300. I would upgrade to this model but do not have enough room between the back of the toilet and bathroom wall. If memory serves, you need 10.5” from the bolts on the toilet base and the back wall to upgrade. Q2: the fix has worked well long term and highly recommend doing it before installing a new 300 toilet. Q1: I only have theory why the issue occurs as Dometic is not inclined to reveal why the problem happens. My take is that a vacuum suction occurs at the seal between the inner and outer plastic bowls when getting up off the toilet. Over time, this becomes worse and more liquids are pulled into the outer bowl. Hope this helps!

[@marynadippenaar8889]

Very helpful. Appreciated 🎉

[@ericbittner6505]

Piss poor design

[@user-iw6lr1ok8y]

Thank you so much for this video. 70 year old woman here. Completed this repair this morning because of your excellent instructions. Sure smells better in my trailer, lol😅. Thanks again!

[@JohnMarucci]

Glad the video was helpful! Congrats of doing the repair yourself!!

[@estherwiley5718]

I am going to try this! Our brand new toilet has smelled from day one! We call our trailer our Covid trailer! They got a kittle break in this terrible time and fast tracked trailers on back order to survive the pandemic. I didn’t blame them for this, but oh the problems we have had! We gave up calling for warranty issues and began fixing things ourselves. We love, love, love, our trailer, but it has been disappointing in some areas. I believe you just helped us with the most embarrassing problem! Thank you so much!

[@JohnMarucci]

Glad the video is helpful. The fix as shown in the video has worked long-term. All the best!

[@bonniewulff8627]

We are going through this nightmare right now and I can’t thank you enough for this video and valuable information.

[@JohnMarucci]

Glad the video is helpful. This fix worked long-term for me. Hope it goes well!

[@z28kindaguy]

Did you do the repair?

[@billray6557]

@@JohnMaruccidid you put any kind of Vaseline on the bottom black seal that seals to the flange?

[@papafredrosebush]

I've been battling this for a few years. Tried every chemical known to man. Was afraid I wouldn't be able to get rid of smell so I went with the 310. Love it... and the smell is gone!

[@JohnMarucci]

Great to hear. Glad the 310 model is working for you. All the best!

[@shortygreyhannah]

I wish I had the ability to communicate with words just how wonderful and relatable this video is. I live in an RV and there is much to love, but being forced to become an expert and diagnose and fix your own rv issues because of failures of sellers, companies, and repair people is not my favorite part of RVing. This is just so relatable. It is so noble of you to make this video to help others. Thank you.

[@JohnMarucci]

It is great to hear that this video has been helpful. Thank you for the kind words!

[@TomBrucker-GoldenYears]

Your pain with the Dometic 300 and follow up video I am sure helped many Rv owners . Thank you very much !!!

[@JohnMarucci]

Glad it helped!

[@marcuse.9522]

This is definitely a nightmare, specially on those hot summer days. Awesome video John

[@JohnMarucci]

Glad it was helpful!

[@juneleanos5825]

SO HELPFUL THANK YOU!!! I’m on a budget and the smell has been driving me insane. So glad you posted this thank you so much

[@JohnMarucci]

Glad the video was helpful. This fix worked well for me long term. All the best!

[@bugsbeeware]

We bought a 2020 Rockwood Mini lite and we have been fighting this ongoing urine smell for months!!! We took the mini lite in to a Family owned RV repair shop and they didn't have your solution! We owned travel trailers over the years and knew this smell was NOT normal. Thank you so much for your informative video. We are so excited to know we can fix this ourselves and we look forward to checking out your website now too. 😀

[@JohnMarucci]

Glad the video could be of help. The solution presented last a very long time.

[@christophlorne6333]

Good job helping folks out! Logical and practical solution.

[@brucehughart4894]

Just got back home from a stinky trip to the coast. We'll be giving this a try in the next couple days. Thanks!

[@JohnMarucci]

The fix as presented has lasted long term. All the best!

[@stevenwinter1661]

Thansk so much for your video! Just got done fixing my Dometic toilet after pulling it and confirming that the outer tank was filled with urine. Gross! Cleaned it all out and followed your instructions here and is working great. Thanks for taking the time to share this.

[@JohnMarucci]

Great to hear!

[@reggie9257]

THANK YOU! for this video. The smell problem developed for us last week. I cleaned the black tank a number of times without success. Then I found this video, had no idea this was an issue, but this was the problem. Not going to try to fix it, new toilet coming next week! Thank you Again!

[@JohnMarucci]

Glad the video was helpful!

[@SoCalSeaChaser]

Same exact situation here and I too will be replacing the toilet and tossing the 300 in the trash where it should be.

[@drbosshard]

Great video! Great advice! We've been chasing down this exact problem for several years and, as soon as I watched this, I was pretty sure this was our exact problem. Your instructions were great and the disassembly was pretty easy. The re-assembly was aided greatly by using the Ace Hardware 10-in-1 multi-tool (2 of them) to put together to fasten the FOUR hex-head screws. You mentioned that an extra-long screwdriver should be used, but I found using the 5/16" hex driver on the multi-tool worked MUCH better! There's no slipping out of the slot then as you would have with a straight screwdriver. We've been out on several camp ventures since applying your fix... and regular inspections appear to show it's 100% solved! Thanks so very much for your great video.

[@JohnMarucci]

Great to hear that the video was helpful. Thanks for adding the tip about using the hex tool. All the best!

[@timothycraig2206]

Just did this repair today. However, mine did not have that 2nd smaller diameter gasket inside that you put caulk on. My rectangular seal had slipped also, so I adjusted it and put silicone caulk around it. Camper is almost 4 years old and just had this leak problem happen. Easy fix though. Thanks for the video! 😁

[@JohnMarucci]

Yep, the fix as shown lasted a very long time without any issues,

[@robertosanchez1186]

Hey Timothy. It’s it still working. I applied this to our rv toilet but it’s still leaking.

[@billray6557]

I was wondering if you let the silicone dry 1st, even though it is waterproof?

[@terrihathaway7285]

Thanks John! Been using your videos since we had an RPod. Recently upgraded to a Wildwood Xlite. This first year out I've brought all my tools with me because something has gone wrong on every trip. I was searching how to remove the toilet when I saw this video. The outer bowl was full of urine. Thanks so much. I was able to fix it before everyone got back from the beach!

[@JohnMarucci]

Glad to hear that the video was helpful! My fix for this worked well long-term for me.

[@Winging-it-1000]

Yes! OMG! Working on it now. Noticed the residual water would turn brown between uses. Thank you soooooo much for your explanation.

[@JohnMarucci]

Glad the video was helpful. All the best!

[@anthonyacosta5330]

Going to do this tomorrow, thanks for the step by step instructions!

[@JohnMarucci]

Glad the video was helpful. The fix as shown has worked well over time. All the best!

[@ab3day]

Thank you for your extremely informative, easy to follow video! We picked up our camper from storage yesterday (after only 5 days…we used it last weekend) and it reeked! I had just read a post on FB from a guy who finally figured out what the issue was. My husband searched KZbin and came across your video. We were able to pull, drain (>1/2 gallon of yuck), clean, reseal and reinstall our unit this morning. Our campier is airing out and the smell is dissipating. I will be contacting Dometic on Monday and see if they’ll send us a replacement unit.

[@JohnMarucci]

Great to hear that the video was helpful! The fix I show in the video has lasted for a long time and many nights use. Thanks!

[@christinalowe33]

Does anyone know how to get rid of the urine smell from the leak the faulty toilet caused? We replaced our 300 with a different toilet and I can not get the Irvine smell to go away. I assume it is still in the subfloor.

[@vince5U]

Excellent video! We purchased a used 2020 Cherokee Grey Wolf Limited camper that’s in great condition. After the second outing, I could no longer handle the smell. It smelled like a stadium urinal. I did remove the toilet and sure enough there was sewage build up. The manufacture label on the toilet was 6/4/2019. I did attempt to seperate the bowl from the base but ended up cracking it. Subsequently, I replaced the toilet with the 310 model. I also want to mention that the manufacturer did not have the flange which was broken screwed into the floor. The flange was seated onto a metal ring that was screwed to the floor by two screws which held the T bolts. I replaced the flange as well which I attached to a pvc pipe which was inserted into a rubber gasket that lead to the black tank.

[@JohnMarucci]

Good call to replace with a 310, as long as you have clearance to do so. Unfortunately, many of us do not have the needed 10.5" or move and are stuck with the 300 models. Thanks for sharing your experience. All the best!

[@4diun]

Amazing. Thanks for your tip from South Korea.

[@JohnMarucci]

Glad it was helpful!

[@davidhoover3597]

Thank-you for this fix John! We had the same issue with a 2016 Keystone Hideout with the Dometic 300 toilet, that trailer,had enough clearance so replaced it with the 310 porcelain toilet problem solved. We upgraded to a 2020 Bullet 2200BHS last fall, haven’t camped in it yet but plan to do your toilet modifications before heading out. Will be interesting to see if we encounter the other issues you have documented. Thanks again.

[@JohnMarucci]

I only wish I could fit a 310 in my unit. The good news is the fix as shown has held up without issue for well over 150 nights of use. All the best!

[@noahmclaughlin3005]

This worked! When I opened mine up, there were NO RINGS! Not even one… so I just put a super thick layer of silicone all the way around, top to bottom and then closed it back up. Haven’t had any smell since! Thanks for the video! 🎉

[@JohnMarucci]

Glad it helped!

[@saltyreef3714]

First trailer, 2022 model brand new, first campaign trip, 5 people. The second day there is a faint smell. I thought the kids were being messy, third day it got worse. I chased it down to a pool of yellow liquid inside with flashlight and an awkward angle in the back. Googling the problem, got me to your video. Going home tomorrow, will try your solution fix. Thank you so much for posting the step-by-step process. It's a shame what the industry has become. Every RV line and product has issues. Sadly, all made in America, and nobody cares. Poor production process, no quality control. Thanks again for the info. And good luck everyone.

[@JohnMarucci]

The fix from the video lasted a very long time without issue. All the best!

[@pin17]

This was incredibly helpful in diagnosing my problem. Ended up opting to upgrade to the 310, thanks for the info.

[@JohnMarucci]

Glad the video helped. All the best!

[@buddyfulgham6515]

Thank you for this "How To" video. We have a 2018 Winnebago Micro Mini that has/had the Dometic 300 and it developed the problems you described. I contacted Dometic, and they declined to replace the unit as it was outside the "warranty period". I did 2 things: 1 Purchased, and installed, the Dometic 310. It mounts VERY close to the wall, but it fits and is a much nicer toilet. 2 I went through your repair/rebuild steps. (We now have a spare should the 310 develop the problem as well) I noticed a couple of differences with mine..... There was only one ring between on the sleeve between the internal and external bowls. The ring on mine is the thicker ring that is shown in your video. There was obvious leakage through the seal between the outer bowl and the base....the seal you did not use the silicone seal on. Before sealing the locations, I pulled the flush ball seal, thoroughly cleaned it, liberally coated all surfaces, in the groove and top and bottom surfaces, with silicone dielectric grease, and installed the flush ball seal back in the outer shell. I did this to prevent any squeeze-out of the silicon seal/caulk that I LIBERALLY applied on the internal rings and the external gasket from sticking to (or interfering with the flush ball seal.....there is very little clearance between the seal and the shells) Oh, one other thing I did differently, I took the water flush valve out of the base. Doing so made it easy to haul each half to the water hose for rinsing and turning things around to better clean without having to wrestle both shells.

[@JohnMarucci]

Sounds like you did a very thorough job. Good call on upgrading to the 310 model as I haven’t heard of the same issue with the 310. It also sounds like the newer 300 models may have a thicker gasket. Not sure it will make a difference on the issue. The fix as shown has worked well over the long haul. All the best!

[@blj859]

Many years ago I’d travel with a spare alternator, fan belts etc …. Never in a million years thought that at some point in my life I’d need to carry along a spare toilet!😂

[@JohnMarucci]

No kidding! It’s ridiculous that I’ve been doing this. The option has been horrible if you have this stench permeate your trailer.

[@kathyrandolph1375]

Thank you!! Appreciate your thoroughness to fix the problem. It is worth giving it a try.

[@JohnMarucci]

Glad the video was helpful!

[@goforet]

Just finished mine..... no small inner seal on my toilet. Went very well just as you explained. But, no fun cleaning where the urine was holding inside. Thanks for video.

[@JohnMarucci]

Glad the video was helpful!

[@mikefitzpatrick1833]

Thanks for the video. We just completed an outing with our 2020 Puma and noticed a strong urine smell at the beginning of the trip. We found your video and did indeed determine the 'outer' area was full of urine that has seeped through the seal. We were able to soak up a lot of the urine and then poured vinegar in the area to counter the smell while we completed our trip. I will follow your video this week to hopefully correct the problem as you have shown. It is frustrating that this model of toilet has such a problem. Last year I had seen issues with this toilet and some mention of a recall but after calling Dometic they said there was no recall and could only be replaced under warranty. Since we did not have the problem then we could not get it replaced. We are now out of warranty, but hey such is the life with an RV. Thanks again.

[@JohnMarucci]

Sorry to this. The 300 model is not a good product and the manufacturer and maker should recall them. I did seal my last one and it has held up well with no issues. Thanks!

[@mikefitzpatrick1833]

@@JohnMarucci I contacted Dometic this morning and they had extended the warranty from 2 years to 3 years which I was just covered. They are sending me a new 300 model but will not arrive until September. However, if they have not changed anything with the design then it will still have the same issue I assume. Meanwhile I took the current toilet apart and cleaned it up and will let it and the seals dry over night. Tomorrow I will caulk and reinstall and hopefully that will cure the problem.

[@mikefitzpatrick1833]

Update: My toilet which was not going to arrive until September arrived two days ago. So do I assume the new toilet is new and improved over the 2019 version that I have or as I tend to believe it is the same toilet design that I have and eventually will fail as well. I am leaning towards putting in the old one that I caulked as was done in John's video so as not to worry about the issue.

[@JohnMarucci]

@@mikefitzpatrick1833 I caulked my existing one and reinstalled and saved the one received from Dometic. Your call.

[@user-ff8vk1zv7r]

Great information. I’ve been dealing with this problem for 4 years always thinking the problem was in the holding tank. I thought maybe the toilet was not tight enough to the flange. When I attempted remove the caps I leaned on the toilet seat and notice drips coming out between the two sections of the toilet. That’s when I started looking for solutions to the problem and was lucky enough to find your video. I think I will apply some some silicone to the bigger seal as well. Thank you for your great video Paul

[@JohnMarucci]

Great to hear that the video was helpful!

[@user-ff8vk1zv7r]

@@JohnMarucci I’m going to put silicone on the oblong gasket as well.

[@cristianorosa1393]

Very good John! Your videos have helped me greatly, including this one.

[@JohnMarucci]

Glad the videos have been helpful!

[@pcOT-0z4]

Thank you for creating this video; I am ezperience the same condition you have created a solution for. I'm going to try your fix before purching a new toliet.

[@JohnMarucci]

Glad it was helpful!

[@patricktorstenson9607]

This confirmed the issue I’ve experienced and what PITA it has been with smell. Awesome tip! Thx

[@JohnMarucci]

Glad it helped!

[@kc-he2xw]

I just did same repair but also used plumbers tape . Directly on plastic bowls and then slid on the gaskets with silicone. As a note there was only 1 gasket on the neck of the inner bowl . Once everything was put together I could tell it was very snug and much more so compared to when I took the 2 bowls apart . Once out together I noticed while looking into bowl of toilet a small gap between the flush valve and upper bowl so I used addition silicone all around the base of the flush valve . I’m headed to Yellowstone hope this repair holds up !

[@JohnMarucci]

Thanks for sharing your experience! Feel free to post back how things work out.

[@nwertz97]

I just took mine apart and discovered only a single seal too. Our camper is a 2019 model.

[@rebeccaharter5707]

We have a 2015 Grey Wolf, with the same toilet. We also noticed the same urine smell. I scrubbed everything in the bathroom and still the smell. After reading online, dometic has know about this issue for a long time. It's a shame that they haven't redesigned the 300 and fixed the issue. We upgraded to the 320 since we did have enough space and no smells as of now. Thank you for the video and if we have to replace the 320 back to a 300 we'll do this before installation.

[@JohnMarucci]

Glad the 320 model will fit. The 300 just shouldn’t be in any trailer. My repair depicted in this video did work well, however, and I’ve gotten over 100 nights without any issues after the fix. Thanks!

[@shawnaoverton7623]

I have the same problem thank you for the tutorial

[@JohnMarucci]

Great to hear that the video was helpful!

[@bishopgeorge1333]

I have a 320 and still have this problem but after watching a few video I will be doing these steps.

[@JohnMarucci]

That's the first I have heard of the 320 having the same issue. Hopefully the same steps will yield good results. This fix as shown has worked well over the long haul. All the best!

[@ronaho8940]

Yep just bought a 2011 copper canyon 5th wheel camper,and noticed a sewer smell every time we used the bathroom,I’ll be trying this method .it has a dometic 300 toilet,I liked and subscribed,thank you very much for the info love the good info I get to fix things.

[@JohnMarucci]

Thanks! All the best!

[@reneedennis9495]

Sir. this video is a life saver.You explained the problem and fix informatively and completely, my partner was able to fix it. We have a 310 it was the same. Thank you for sharing this.

[@JohnMarucci]

Glad the video was helpful!

[@justinkeller4008]

I have a 310 that I think has the same issue. Thanks for the comment

[@ericbarnes5215]

I have this exact problem. Thanks for taking the time to figure this out and share!!!!!

[@JohnMarucci]

Glad the video is helpful. FYI, the fix as shown in the video held up for the long term without issue.

[@user-yj5bj4ei4n]

I have the same problem with mine. I’m going to try your method of fixing the problem. Thank you for making the great video/videos. Awesome channel

[@JohnMarucci]

The fix as shown worked well for a long time. All the best!

[@williamfry6087]

Amazing, your attention to detail and methods are great.

[@JohnMarucci]

Glad the video was helpful!

[@bw6078]

Why would they use two seal rings on the same connection? I've never seen that work in any situation. Thanks for sharing.

[@JohnMarucci]

I also have no idea why they would do this. Thanks for sharing!

[@patriciapurdy6664]

We had the same problem pretty much did what you did and it has worked for 2+years. Now we have a new issue. The pedal won't open the flush valve at the bottom. I just bought a new Thetford toilet. No more Dometics for me. Thanks for the video.

[@JohnMarucci]

Thanks for sharing your experience. All the best!

[@Drewberg316]

Great video, thanks for putting it together. I myself just started having this issue about 4 weeks ago and I had no idea what the smell was until typing in specific wording into google and boom there was my problem. I cleaned non stop thinking kids were missing the toilet and yet it still stunk. Since my toilet was under warranty they sent me another 300 to install and they claimed the issue is completely fixed now on the new 300 toilets, but I wonder if they really are? I think I’m going to play it safe and follow your video so I don’t have to go through the issue again. Thanks again for the video, safe camping.

[@JohnMarucci]

It is possible the new model is clear of the problem but to your point, how will you know until it is installed and hopefully working. I suppose I would do what you are considering and caulk the seals on the new toilet. Mine has worked flawlessly over 100 nights of use since the fix shown on the video. Thanks!

[@Drewberg316]

@@JohnMarucci I rather be safe then sorry at this point because it’s my only replacement they will give me free of charge. Rather not find out the hard way it’s still a problem, so might as well take an extra step and be safe. Thanks!

[@ptooti]

@@Drewberg316 I got a replacement from Dometic and did the re-seal on the brand new unit just to be sure the new unit i got had one seal and a hard plastic ring like a spacer I just gooped the heck out of it and put it back together and installed so far so good

[@Drewberg316]

@@ptooti I did also get a replacement toilet from them. The new one like you said had a plastic and rubber seal. I took it apart and sealed it and it failed within my first few uses. So I took it back out and back apart, cleaned it up and sealed it again using a ton of caulk this time. Hopefully it’ll hold up, we will see.

[@erniehampton5809]

Thank you for your exceptional video. Thoroughly explained everything , thank you very much you’ve made it very easy to understand with a few great tips .

[@lindagardner1257]

Same issue just started checking in on it. Hope to solve it soon. Thanks

[@JohnMarucci]

Just a quick note that the fix on this video has held up for months of regular use with no further issues. Thanks!

[@user-fu7lt1vk5q]

Thanks, very helpful. Same inner to outer bowl leak and resulting odor from collecting in the outter bowl. Will repair it the same manner until we find a suitable replacement. Thanks again.

[@JohnMarucci]

Glad it helped, the solution as presented worked well for the long-term.

[@huntinzombie29]

I'm no rocket scientist...but what an absolutley piss poor design. We are having the exact same issue. I stuck my hand with a lysol wipe inside the rear of the toilet. It came out stained yellow and smelling horrible. I cleaned as best I could and sprayed inside the area with a good enzyme digester. It worked for a month or so, then the smell returned. I checked the same area with the same result. I found your video and voila....I am replacing mine with the 310 version. I will do whatever I have to make it happen. Thank you for your great in depth video.

[@JohnMarucci]

Bret, glad the video helped. Also glad you have the additional space to put in the 310. I think you’ll be much happier. All the best!

[@strangeadv4977]

Sorry to hear about the crappy situation John 😉 We all appreciate your thorough work to make and edit a video like this. Just dropped off the Rpod 202 for some warranty work but thankfully this was not one of them. Keep it up my friend!!

[@JohnMarucci]

Thanks, will do! Hope everything goes well with your R-Pod!

[@daylenisfernandez8574]

Thank you so much for your video, we are having the same issue and could not figure what the problem is. We will definitely do the repair process.

[@JohnMarucci]

Glad the video is helpful!

[@googleyoutube766]

so I have a 2019 Keystone and in May 2023 we found this problem. I bought a new Dometic 300 (only one that fits with the wall clearance) and installed it. 8 nights of camping later the smell is back. Called Dometic and they will replace it under warranty and continue to replace it for 2 years from my original purchase date; so if you buy a new one SAVE YOUR RECEIPT. I had a long chat with a second tier support person. They are aware of the problem and are actually trying different gasket materials but she said just keep my receipt and if it leaks let them warranty it. I am going to try this repair on the 2023 model that I just replaced and keep it as a backup for when my two years is up. Hey John, how about a quick update on how your repair worked out over the long haul?

[@JohnMarucci]

The repair I showed has lasted a very long time without issue. Thanks!

[@dpd653]

Hey just wanted to say thanks your video was one that helped me do the swap out. Appreciate it.

[@JohnMarucci]

Glad to hear that the video was helpful!

[@myronmcginley7053]

Excellent! Thank you & safe travels.

[@JohnMarucci]

Glad the video was helpful! This fix has work long-term for me.

[@KevinandKimOutdoorAdventures]

This sounds like the exact problem we have with our 2020 bullet Thanks.

[@JohnMarucci]

FYI, the solution as presented worked for a very long time.

[@RobinGates-t9f]

Thank you! We took our toilet apart as you did in video. Ours only had one seal on it. Manufactured in 2016 and in a 2017 Roo. Should we add another seal?

[@JohnMarucci]

I'd try the silicone fix as displayed first. It may work just fine. You can always circle back, but the fix as shown should work.

[@rickvanderp6988]

I have had the same issues!!! I will try your solution! Thanks

[@JohnMarucci]

The solution has worked well for a while now for me. Well over 100 nights of use after the fix and no issues. All the best!

[@garyrose2074]

You just fixed my issue. Thank you so much!

[@JohnMarucci]

Glad I could help!

[@pauldurocher9948]

same problem you had, will repair, thank you for the info....

[@JohnMarucci]

Glad it helped. The fix as depicted worked long-term for me. All the best!

[@richardbriggs3868]

I had the same problem and tried your fix. Will follow up if i have any issues

[@JohnMarucci]

Sounds good. The fix worked well for me long term.

[@JimC714]

Thank you so much!!! This was exactly what happened to us!

[@JohnMarucci]

Glad the video was helpful!

[@rbh6479]

Great information. We have this same issue & apparently Dometic hasn’t taken care of the issue because the manufacture date is May 2022 on the sticker. Looks like I have a project. Thank you.

[@JohnMarucci]

Glad to be of help. The solution presented lasted well for me. All the best!

[@MR-si1eq]

I have a 2021 Forest River Rockwood. Knock on wood. So far, so good. If there is a problem I will have them replace it if its still under warranty. Otherwise this is great future info. Thank you.

[@JohnMarucci]

Thanks for the comment, all the best!

[@michaelhaney342]

We had this issue when this video first came out did this reseal worked great but now its starting to to it again. We are going to pull it back out and re do it but think im going to go thicker and with new seals. Appreciate your video its sad that they keep selling this toilet with no redesign.

[@JohnMarucci]

The fix as shown lasted for a very long time, to the point that other parts of the toilet were getting worn out. I replaced the toilet again last spring with a new 300 and immediately did this fix before installing.

[@sueharris8685]

Thanks for your video. We have the same problem with our 2020 Rockwood Minilite. I hope they will send me a replacement.

[@JohnMarucci]

The repair isn't very difficult if Dometic won't send a replacement.

[@franciscocontreras5470]

Great video. Thanks.

[@jaysom2240]

Yep yep and yep. Great video. Thank you.

[@JohnMarucci]

Glad the video was helpful!

[@stonybuckner9928]

we have the same 300 medel Dometic in our RV and same issues causing some leakage of water around the base at the floor. Also flushing ball valve sticks every now and then in open flush position finally relaxing and stopping most episodes but often requiring me to cut the water off for a few hrs to a day . I installed an inline cut off valve to enable us to continue using the water supply for the rest of the camper while this issue happens.

[@JohnMarucci]

I also installed an in-line cut off valve at the toilet which is comes in very handy. It isn't too difficult to fix the toilet but you do need a very long flat head screwdriver.

[@uhhuh6323]

Great video it helped me greatly 😅

[@JohnMarucci]

Glad to hear it!

[@kylehnat259]

I just got home from a four day camping trip of blaming the kids the whole time on missing the toilet. Your video is spot on with the issues I’m having. Smell starts off faint and now it is horrible. Like you said no sewage smell just urine. Hopefully I can get this fixed because we have a lot of trips planned!

[@JohnMarucci]

I used my trailer for well over 100 days after the fix depicted in this video with zero odor issues. So far, so good. Thanks!

[@jeffreyshort9243]

Great video well explain you been a great help!!!

[@JohnMarucci]

Glad the video was helpful!

[@clearskyamerica3107]

Thanks for the video. We have a 310 that is leaking at the base and Dometic informs me since we are the second owner there is no warranty. Very bad design, very common problem, and no support from the manufacturer. They should have a class action lawsuit filed against them.

[@JohnMarucci]

Glad I could help. Dometic has done poorly by its customers generally imo.

[@michaelemhuff4196]

Same problem. 2020 prowler 240rb. All ready replace leaking foot valve myself. Called about recall said needs to be an rv dealership. Why I do better work and that is obvious by all the problems I've fixed while under a worthless warranty. Thanks I will try when we get home it is obvious this is an issue with the toilet.

[@JohnMarucci]

The fix I did in this video has lasted. More than 100 nights use later an no issues.

[@rfigueroa76]

Thanks! Great info. Called Dometic today. They said I should have a new toilet delivered to my house in 10 days. In the meantime, I'm on the road for the next two weeks so I will use your method. I see you posted this video sometime ago. How long did your fix last?

[@JohnMarucci]

The fix last a very long time without issue.

[@lickitysplit2413]

My Dometic 300 toilet only had the thicker seal in that area. I did not have the o-ring type seal in that area. I slid thicker seal back on and applied Lexan caulk in that area along with applying it on bottom and top side of the foam gasket that seals pedestal to bowl area.

[@JohnMarucci]

Sounds like a good fix. Hopefully you won’t ever have the issue. Thanks!

[@tonydanielleirby9180]

Id like to know if this compleatly fixed the issue and is it still working

[@JohnMarucci]

It did fix the issue and I used the trailer over 100 nights since the fix without the issue recurring.

[@ptooti]

My opinion I don't think it's a vacuum problem as these inner and outer bowls are not air tight (at all) between the two. It's probably just leaking wastewater But your video is great and I did my Dometic 300 as well thanks for the video

[@JohnMarucci]

Thanks for sharing!

[@theomatthias9804]

So, what’s the verdict on the long-term effectiveness of this fix? Has the inner bowl leaked into the outer bowl during the last 20-months? We are trying to find another toilet compatible with our 9” offset but haven’t found one. If this fix works in the long term, I’ll start on it right away!

[@JohnMarucci]

The fix held up without ever leaking again. The video was shot on November 19, 2021 and we had to replace the toilet due to normal wear (foot pedal spring was worn out) on February 8, 2023, after over 220 days and nights of full use. I immediately sealed the gaskets when installing the new one. Highly recommended.

[@davidball3349]

Because of the urine odor in my TT purchased in 7/2021, I removed my toilet today and disassembled it as shown in this video. There was a significant amount of stinking liquid in the outer bowl. I dumped the liquid, cleaned the inside of the outer bowl and outside of the inner bowl. My toilet had a clear seal and a black seal instead of two black seals which I guess won’t make any difference.? Toilet Manufacture date was 5/12/21. I’m going to apply the silicon caulk to the seals and reassemble it. Hopefully this will fix the situation since we’re going on a 3 1/2 week trip in two weeks! I guess we’ll have to wait and see.

[@JohnMarucci]

Hopefully it will work well long term. The fix done in the video has held up well for me. All the best!

[@davidball3349]

@@JohnMarucci I haven’t been able to see about urine leaking since it’s just sitting under the shelter but now it won’t hold water. Maybe I didn’t get a sufficient amount of silicone caulk or somehow gaps were left. ?? The clear seal is more of a plastic ring. It seems that a better seal would be made if the rubber seals were up against the plastic ring. I.e., not two flexible seals up against each other. Any thoughts?

[@JohnMarucci]

Sounds like possibly it may not have been reassemble properly? Maybe try it again?

[@davidball3349]

@@JohnMarucci good news! We called Dometic. The customer service lady was well aware of the issue and was very helpful. Since they’re out of the 300’s we’re getting a 310 at no charge! May not be here before we leave for the long trip so I’ll have to make sure I get this fix to work for the trip. That’s ok there!

[@MarkM-xd2zo]

I have a 2020 Flagstaff Microlite that I just purchased four months ago. Since I bought it, I've been fighting the sewer smell and approaching it from the thought of it being an issue with the tank. I've discovered after a trip with this, when I arrive at my destination, there appears to be light colored were on the floor which is gross! today I finally discovered it's coming from the back of the toilet opening near the water lines, Now I know there is sewage inside the outer bowl after we've used the toilet for urine only, water apparently is getting into the outer bowl which splashes out while towing. After watching this video, I think I will just replace the toilet this is not something I enjoy working on.

[@JohnMarucci]

The job isn’t too difficult but it is a bit disgusting. I am sure a local RV dealer or a mobile RV tech would be willing to replace the toilet for you at a price. Thanks!

[@MarkM-xd2zo]

@@JohnMarucci I spoke to a local dealer, they can install a new 310 model for approximately $500. Thats slightly more than I'd expect but willing to pay it just to not have to deal with it. We bought the trailer used so messing with that, makes it even more unappealing. thanks for the reply. :)

[@z28kindaguy]

Nice caulk!

[@JohnMarucci]

Caulk is my least favorite thing to deal with. Thanks for noticing!

[@sethwarren9663]

Great video! Only had one seal ring present when I took the toilet 7:43 apart. The smaller one is missing. Do you know where I could purchase one?

[@JohnMarucci]

I think the units with only one ring are later models. I am not sure where you would get a second gasket or if it is needed. Others have followed the procedure in the video and applied silicone to the single gasket.

[@evenstargalaxy9586]

John how did the repair hold up? Did it resolve the leak smell problem?

[@JohnMarucci]

The fix as shown worked well over the long term. Still highly recommended doing this.

[@evenstargalaxy9586]

@@JohnMarucci thank you. Took mind apart today. It went well thanks to your awesome work. I also contacted Dometic, they will not replacement but have a repair “kit” that contains new gaskets and a “retaining ring”. We’ll see what comes from them. Thanks John. Love your videos.

[@toddsigler4407]

Hello, Thanks for your video. Like many, we have recently encountered this problem. Original toilet built in 2019. They sent a new toilet manufactured in May 2014. Has the problem been fixed in this toilet or do we need to “enhance” it before installing it? We appreciate you.

[@JohnMarucci]

I am hearing that the problem has been fixed, but I personally would still do the process I show on any new 300 toilet (although it may void a warranty). The fix as shown has held up over hundreds of nights of use. All the best!

[@toddsigler4407]

Thank you so much. That is exactly what we did. Appreciate you.

[@christinalowe33]

We just went through this too! I wonder how the manufacturer can be held accountable?

[@JohnMarucci]

I don’t think there is any recourse other than to expose issues like this online. It’s important to also expose the RV manufacturers who continue to use certain components. This specific toilet has fully ruined many people’s camping trips.

[@christinalowe33]

@@JohnMarucci How did you get rid of the urine smell? I am pretty sure it leaked into the subfloor.

[@dougl6219]

Thanks for the helpful video. I would suggest cleaning the sealing surface on both the inner and outer bowl with a degreaser, such as brake clean or electronic contact cleaner to help the silicone sealant bond to both surfaces. This will also make it very difficult to separate the inner and outer bowl a second time, as they will now be glued together.

[@JohnMarucci]

Thanks for the suggestion. As an fyi, the solution in this video seems to have worked as I was in the trailer for over 100 nights after the fix with zero issues. Thanks again for the comment!

[@GratefulWarriorMom]

Hi, thanks for the video. Im dealing with this now with my dometic 300. I just pulled it out and the subfloor is ruined. Id like to get dometic to replace it but in the meantime, i still need the toilet. I will attempt this repair and see what happens. We had to break the flang as it was stuck or glued in the tank somehow. My dad realized, after the fact, that it screws in somehow. So, i guess i have to get a new flange, if possible. What happened with Dometic sending you a new toilet? Did the fix work for the long term?

[@JohnMarucci]

It took months to get a replacement toilet last time. The fix as shown did work without any issues long term.

[@Livefreewhileucan]

Me too. 2018 bullet premier. Stiiiiiiiinnnkkkky

[@JohnMarucci]

FYI, the solution as shown worked well for a very long time.

[@dad2girls603]

John great video. Can you explain whether silicone chaulk or or grease is better. I'm doing mine tomorrow and a few sites mention grease. I have clear DAP that says it's better than silicone. Thanks in advance.

[@JohnMarucci]

I used clear silicon and haven't had any issues. Generally a good waterproof sealant should work.

[@dad2girls603]

@@JohnMarucci I just did mine and mine only had 1 gasket on inner flange. I got it all together and sprung a leak where the 90 attaches to the flush valve.. trying to figure out that diameter for tomorrow's fix.. lol.. thanks for the help..👍👍

[@tammieeakins3060]

I have the same problem and I am wondering if replacing it with a porcelain would help. It was replaced by the dealer before warranty was out. Since then, the replacement does not allow the flap to close and water to fill into bowl, as the original did. Is there a fix for this that you know of?

[@JohnMarucci]

If you can replace the 300 model with the 310 ceramic bowl model, it may be worth it. The main issue is you need more clearance behind toilet to accommodate the larger size 310 model. The rough in measurement goes from 8.5" to 10" from the 300 to the 310 model, so be sure you have this amount of space from the center bolts to the wall behind the toilet. Here is a link to etrailer for several of the models: www.etrailer.com/dept-pg-RV_Toilets-pm-Dometic.aspx

[@user-vo3ul9zo6v]

John, been searching for this solution for some time now. I tore toilet apart but I only have 1 seal between inner and outer bowl. One seal looks flat and other looks like an o-ring (i have this one). Could I pick up a seal at big box store to add or should I put it back together they way it came apart? Thanks for the unfo

[@JohnMarucci]

I would follow the step in the video and not add new gaskets into the toilet. Just apply the silicone as shown to the gasket already in the toilet.

[@shawnapooley8946]

So I have this issue, but it also makes my water pump randomly kick on . Will this fix also fix the water pump from kicking on randomly? (So long as I have no water leaks elsewhere)

[@JohnMarucci]

Take at look at my video on the water pump issue if you haven’t already: RV Water Pump Troubleshooting kzbin.info/www/bejne/hpXXfp2ugd-bgLM

[@markrose8622]

Your video was fantastic. I think this is my problem however I have the 310 model. Do you know if I can take it apart and do the same fix?

[@JohnMarucci]

The 310 should not have the same issue. I believe it is a one-piece bowl. Likely you have a different problem. Thanks!

[@justinkeller4008]

Did you ever take yours apart?

[@rocksteadybullsxlpitbulls4514]

I can't find any information on inside gaskets for 310 model. It just says dometic doesn't recommend taking the toilet apart

[@JohnMarucci]

I haven't heard that the 310 has the same problem.

[@brucepherson417]

Hi John, I have a question. I took my toilet apart and there was only one seal in there. Do all 300’s have two seals?

[@JohnMarucci]

I believe they may have changed the number of seals at some point. The solution should work indifferent of the number of seals.

[@davidcooper3871]

My base seal is leaking since the 4 flathead screws are loose. Waiting for that special oblong gasket.

[@JohnMarucci]

So you plan to replace the oblong gasket and reinstall the same toilet, correct?

[@tborto7447]

So this doesn't apply to the porcelain bowl models? We have a 310 plastic bowl and are going to a 320 porcelain

[@JohnMarucci]

Correct, it should not apply to the porcelain models.

[@tellsitasitis]

John, do you keep your fan on in the bathroom? Exhaust fan?

[@JohnMarucci]

Not all the time. Usually when using the bathroom and then to get a breeze through the cabin at times. I did have the stock fan replaced with a Max Air fan for more flow. Thanks!

[@alcornat3]

I noticed that I only have a single ring and not two. Should I just caulk over top of that ring?

[@JohnMarucci]

That's what I would do.

[@user-cu1gf2en3h]

@@JohnMarucci I had the same question - mine has a plastic spacer ring, and only a square ring. I plan to to caulk well over all, after acetone cleaning to remove any silicone grease and then a light (400 grit) sanding for better adhesion.