How I Build My Twinset (Corrected)

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Diving on twins is my favourite way to dive. I enjoy rebreathers and I've spent some time on sidemount but my heart will always be with twins.
Only, when I first wanted to make the move to twin cylinders I couldn't find much information about how to build one. so, I figure it might help someone to see how I Build and assemble my twin set.
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Music: Sport In
Artist: Eleone
Download: audiojungle.net/item/sport-in...
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The most important thing about scuba diving is that you do it safely. And that is what Safe Diving is all about.
On this channel, I will discuss all aspects of going underwater from equipment advice and techniques to the little things like what to pack in your bags for a dive trip.
My entire professional career has been spent in and around the scuba diving industry and travelling to diving destinations both warm and cold.
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In accordance with COPPA laws, please note that videos on this channel are not specifically made for, or targeted at, children.
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Safe Diving
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[@ivoryjohnson4662]

Appreciate you taking the time to clear it up. It seems there are a lot of armchair divers just looking to pick. Diving twins are great for me esp post covid my lungs are no where what they used to be, Please keep up the good work you do,

[@emmanielson4633]

Very informative video for a newbie twin diver like me... just had my twin 7s picked up from servicing and looking forward to getting it set up and trying it out. Thank you

[@titusknight3712]

I Love this video, I’ve been diving singles for about a year but have been looking at doubles, just didn’t know what I needed, why, or how to set it up, thanks for the comprehensive breakdown

[@danieldebey7951]

I do cold water diving here in Monterey, CA. I want to extend my bottom time now that I have moved to a drysuit and cold isn’t as much of a factor anymore, I feel doubles is my next step. I just purchased a twin Agir 45lb lift wing and wanted to make sure I was choosing the right size tanks going in. I currently have 2 Faber blue steel 100s that I was considering banding up and putting a manifold on, but unsure if these tanks are too big or not. I am gearing up for a GUE fundies class next year and wanted to get comfortable using twins and figuring out my buoyancy going in. Thank you for the daily videos they are bringing joy to my early morning commute and are the perfect amount of time to get me from home to work. You guys rock!!

[@CaseyKlaus]

Really enjoying the new channel. Great work. I'm considering switching to doubles. Lots of good reasons to do so. Thought about side mount but as I'm looking at pros and cons each in relation to wreck diving the US Great Lakes, doubles seem like the better option.

[@sbmillward]

Interesting and Informative. Nice tip about cutting an angle into the waistband. Thanks!

[@djsalose]

You can also soak the end in superglue.. thern its even easier to get it in..

[@bostonmckibben1840]

Could you do this for your sidemount setup too.

[@paulmorgan1793]

yes 2x faber 12ltr is a great sm tank setup.

[@blacknblue11]

Hi mark greetings from Norway. I Just love your youtube Channel and i Just discovered the podcast. I was wondering if you can make another video about twin set🙈 some tips and tricks about led plasement/trim. I'm getting into my first twinset dive when my equipment is back from service. I have never dived with twins before so i want to be as much prepared as i can be. Keep up the good work😁👍👏

[@Notoriours]

Amazing video .... love the way you explain things Can you please make more videos about twins ? I have a question though... for a beginner driver is it a good idea to invest on X-TEK Donut Wing, 18kg/40lbs for the purpose of training on single cylinders then moving up to doubles ? Or should I invest on the a proper single tank back plate then get the double back plate ? I hope I am making sense .... Again Thanks for the video

[@kimhaydon]

Great video. How do you set up your computer with a twin-set?

[@youwishyoucould4238]

Nice video! What kind of first stages do you use? Are those the tec3 or the dst? I'm wondering because I'd like to have a reg set that i can use on sidemount and doubles equally, but i wonder if my hoses would end up all messed up...

[@wildfamily2018]

What do you think about Hollis? Which wing would you choose from them?

[@GSUIG]

Is there any way I can get one of the V-Weights you guys sell. I live in the U.S. & it seems you guys don't ship them here. You guys make them very well & actually coat them.

[@tomasjonsson3064]

I make an X on the bottom of the tanks with duck tape to prevent wear.

[@karlthediver]

Good to see you dispensing knowledge again! I'm just getting started on twins, and my regs don't have that handy port on the end, which makes hose routing a bit more interesting. How do you recommend routing hoses in this case? Thanks!

[@SafeDiving]

It can be done without a 5th port, you just fit your first stages sideways and let the hoses route downwards. Just means that your hoses bend a bit. There are some good images here: www.scubaboard.com/community/threads/tek-3-vs-ds4-for-doubles.286405/

[@karlthediver]

@@SafeDiving Excellent. Thanks!

[@mattvish2591]

I will definitely move on to twins, main concern is the weight, guess will add around 20kg. Already a single with integrated weights can be quite a hassle to get on a boat, specially with high gunwale, flimsy over ladder and choppy waters. So handling is a topic for it self but some other questions: 1) If one of your tank valves are closed you won't recognize it unless you notice your air consumption or close the isolation, correct? 2) For repetitive dive would you change tanks or dive half empty? 3) I heard you could top up from singles during surface intervals, how to do that and what to consider? (pressure will be half/single but volume should be double I guess) 4) If you don't use a transmitter would you use a 2nd SPG? 5) Isn't adding a 90 deg swivel to your primary another failure source? 6) Do you travel with twin gear, bring your own bands etc. (besides tanks and weights of course) A bit extended questions now for general discussion and possible clips: A) Piston or diaphragm, what do you prefer and why? (I like diaphragm because they are more compact, but piston appears more simple/reliable) B) I was looking into the Mares Loop as a kind of crossover recreational solution, maybe a 5 feet hose and no need to loop it behind the neck, what do you think? C) More air means you get longer bottom time, I really wonder why most agency don't teach Deep Air (anymore). In the age of dive computers it should not be an issue to push beyond 40m on air, especially on doubles and take some deco time. Enforcing trimix courses for 40m+ appears strange to me, also you pay quite a premium for it. Helium got and will get even more expensive. At many good places (good/best bec. remote but less infrastructure) you don't get trimix (or not even nitrox). Just for example, one of my bucket list dives in Aceh/Indonesia, kzbin.info/www/bejne/l5PNoZKed7-kfas ...some local dive centers take you on a 60m bounce dive on singles to see the wreck. Only guides and newbies get a front mount bailout bottle. They also hang couple of cylinders at 5m for decompression. Maybe a bit strange/risky approach, what you think? I would prefer it on doubles and some proper training before I endeavor to the Sophie Rickmers. Sorry for long comment and questions, I don't expect you to answer all/detailed. I really appreciate your dedication to your new channel, thank you for sharing your experience! PS: D) When will you restart the Simply Scuba Channel and will you continue your channel in that frequency? E) I love your Safe Diving logo, I will order some Ts as soon I can come to Europe, however I would love to see a versions with small left chest logo with opt big back logo and a polo version. Cheers!

[@SafeDiving]

OK, so: 1) if one tank vavle is closed (and the manifold is open) then the only way you'll know is that one of your inflators or regulators won't function properly. The best way to notice is that your SPG wont change if your left is closed. With the manifold open you will breathe from both tanks through one valve. 2) no, unless I was significantly low, anything below 120bar and you're on less gas than a single 12L. 3) you can, you'll need a whip with a bleed valve to connect the tanks but as you say you won't get a great fill because the pressures will all equalise. You'll get a little boost but not much. You'd do better to take that tank with you as a stage cylinder on the dive. 4) no, the only time you'd need a 2nd SPG is if you're isolating your tanks, in which case you're probably bailing and surfacing anyway and you know roughly how much gas you had in your tank when you isolated. 5) yes, +1 failure point. 6) most dive centres will have their own twins set up, so all I'd bring would be backplate, wing and regs. They usually provide the tanks twinned up, just call or email first to be sure. A) 20 years ago there was more of a difference between the two but now there's not much to sway either way. B) the Loop is a clever design but more made for a stage cylinder to make switching easier. The main reason for the 7' hose is so that two divers can swim single file through a confinement while donating. You're thinking the right way though and looking at different setups to improve. C) yeah, I'd rather have my own stage tanks for a dive like that. I've done the swim through in Elphionstone at ≈50m on a single 12, but if something goes wrong it's better to have those hang tanks with you. I think rebreathers will take over OC trimix in the next generation with He costs and limits. We'll still use it for bailouts but deep dives on open circuit will probably start to phase out. D) I really dont know TBH, circumstances may change... E) yeah, I'm creating more designs so I'll make one with a small Logo on the chest. Teesprings can ship outside of EU so double check if they can be shipped to your home. teespring.com/stores/safe-diving

[@landynbyron5728]

I dont mean to be offtopic but does anybody know of a tool to log back into an instagram account? I was dumb forgot the password. I appreciate any tips you can give me

[@landynbyron5728]

@Thomas Asa I really appreciate your reply. I found the site thru google and im waiting for the hacking stuff atm. I see it takes quite some time so I will get back to you later with my results.

[@landynbyron5728]

@Thomas Asa it worked and I now got access to my account again. Im so happy! Thanks so much, you saved my ass !

[@thomasasa5610]

@Landyn Byron no problem :D

[@amrudiving]

is there any other ways for adding weights than this bar? if i'm using tank straps where is the best place to put weights on tank ?

[@alexthomas4671]

Several new ideas....strap loop, hose for sending unit, longer hose with 90. Very informative.... Personallly, a OMS wing video would be great! Thanks!

[@paulmorgan1793]

OMS wing is over priced crap. I had one! the massive bunnies are an accident waiting to happen. A simple no bungee wing is perfect. DTD-Xdeep etc.

[@djsalose]

@@paulmorgan1793 i have a oms wing (not using it) with two inflators.. But I can fill in one and empty from the other.. So I dont really understand why they have 2 inflator hoses..

[@ConnieJ24xx]

Where can I buy that lead block? Everywhere seems to be sold out

[@darthbigdaddy]

I noticed that you have an A.I. pressure gauge on one first stage and another brass pressure gauge on the other first stage, are they meant to tell pressures in the two tanks separately or since they are connected, they will tell the same pressure and the brass one is just a redundantcy? Does the A.I. gauge know that it is being attached to a twin set and recalculate the time accordingly? Thank you!

[@andybrocklehurst7461]

Do I still need a weight belt with twins if I put a trim weight between them and obviously the weight of the extra cylinder ??

[@vparansky]

Like to know what is the advantage of 90 Degree LP 2nd Stage Swivel vs 70 Degree. Thank you, Mark.

[@jeromemester4627]

Currently fir my twin set I have twin 50's steel.What brand and size are your twins on this video and are they steel or aluminum. I must admit the twin 50 steels are heavy as an elephant. What is your preference steel or Aluminum and why

[@philipalexi6514]

gosh...20kg for the tanks, each..on top of that, you add this V-weight...amazing...I would sink and never get up.. I dive with D8.5, Alu backplate and zero weight. ' drysuit and 400 undergar....

[@wallacesify]

Hi Mark and thanks for another great video. I'm just moving to twins so trying to absorb as much information as possible and your vid is very clear. Just one question, I'm using DS4 first stages so no 5th port, would the hose routing be better with the dry suit hose on the right hand post and is there any reason not to do this?

[@djsalose]

BCD/Wing on the right, Drysuit on the left.. If one 1stage fails during a dive you always want to have 1 airsource and one bouyance device..

[@argonk]

Very informative. Would you recommend a 20 or a 24 kg uplift BCD with a double-12 in cold water (around 3 ºC)?

[@chrischristofis8501]

That is a good question, try inner space explorers for an answer, but opinions vary

[@sskiver11]

Sorry I didn’t hear what you called it but would like to see a bit more closer detail on the part your using to make the harness easier to adjust and get in and out of easier! Thanks

[@SafeDiving]

It's an Agir Harpa Loop. They're not the easiest to get hold of, but there are a few copies around like the Mares XR SF2. Which is pretty much the same thing

[@matthewhoffman8090]

What would be a good wing set up for twins for a new diver

[@paulmorgan1793]

google DIR diving. xdeep make nice wings. BUT just go sidemount.

[@matthewjones5731]

If you have to shut down the first stage with your BCD inflator, would you swap your dry suit hose to your BCD or just control your buoyancy with your dry suit ?

[@djsalose]

Most of the time you dont need to fill anymore since you will only go to the surface when the 1stage dies.. But if Im inside something and need to go up and then down to get out i would use the dry suit..

[@ScubaHockeyDoc]

Mark Why do you have your SPG on one post and the computer AI transmitter on the right post? Is there a reason why they couldn't be together on the Left? If you shut down the right sided valve you would lose the info for your computer. I realize you will use your SPG then for your ascent. I have my SPG and Air transponder on a high pressure "splitter" coming off of a single port. I too have the transmitter on a short HP hose. Will be starting my tech training with doubles in January.

[@djsalose]

as you probably know now if you did your tech training.. the right valve only turns of the 1stage on that side.. it does not seperate the two bottles.. Why use a splitter with 3 extra o-rings that could fail when you have 2 HP ports on your gear to start with =)

[@meeno252]

I was wondering Is it possible to install 2 transmitters to twin and how is the computer going to handle it. if it's possible

[@djsalose]

Yes its possible.. but why would you want to?

[@Biodoc100]

Never tried them before, but I am definitely interested. I saw a video the other day where they were (as sellers of sidemount gear) how twinsets make you unstable in the water while relaxed (prone to turtling due to the high center of gravity. is this accurate or blown out of proportion?

[@SafeDiving]

I've never had an issue with twins, sidemount is undoubtedly more stable in the water, but as with so many thing there are a lot of variables that can affect your stability in the water on either... It's not a common thing with twinset divers where we're constantly fighting to stay upright...

[@Biodoc100]

@@SafeDivingThank you for the insights!

[@simptowngaming159]

What is that d ring you use on the bottom left side of your plate for adjusting the harness when you don it?

[@SafeDiving]

That's an Agir Harpa Loop. there have been a few copies over the years like the Mares XR SF2 or the Tecline Chinch

[@simptowngaming159]

@@SafeDiving thank you so much. Love the content. Keep it up

[@nzams1]

What is the new wing you are waiting on?

[@SafeDiving]

Apeks have a new wing coming out soon, but it's a secret so don't tell anybody

[@dannyholden5361]

Isn’t a p-weight designed to go on the backplate? And a v-weight goes between the cylinders?

[@SafeDiving]

My bolts were a bit short to put them that side of the backplate. They fit quite nicely between my tanks though.

[@robdahler9608]

nice video only the melody in the background is annoying.

[@xiiivaniix]

Hello, I have an important question bothering me. I bought an Xdeep Zen deluxe and afterwards I went to two dive shops looking for accessories and they told me Xdeep was an off brand. Is this true? I thought they were one of the best?

[@SafeDiving]

An off-brand? Nah, they're just different to what they probably sell. XDEEP make great dive equipment but they don't bother making things universal like the traditional brands

[@xiiivaniix]

@@SafeDiving thank you! I thought so too. Trying to get me to buy their own equipment.

[@dring83]

there is no way those regs you used in the video breath better than those cyklons hanging up on the rack? right?

[@darkburnstar9269]

Is there a way to be educated in using doubles without having to take a PADI tech 40 course?

[@harrypink715]

darkburn star TDI intro to tech

[@wallacesify]

Darkburn star I did a PADI twin-set specialty course but don't know how widespread it is.

[@timgosling6189]

Looks like you need some new nuts on those cylinder bands. I use A4 marine stainless steel hardware from Accu; M8 bolts and nuts are exactly what you get from Scuba branded suppliers but at significantly higher cost. Also, your cylinders shouldn't weigh 20kilos! My Apex 232 12litres are 12.7kg each.

[@djsalose]

Yes.. It sounds heavy.. My faber weigh 13,9 each.. (232bar 12l)

[@sbird7251]

Which side of the waist buckle is preferred for the crotch strap. I was thinking on the male/free side to allow it to fall free when the waist buckle is released (quick exit). However seems most people have it between the buckle and the hip... maybe so they DONT lose the crotch strap if the buckle is opened.

[@djsalose]

Why would you want to exit your gear?

[@sbird7251]

@@djsalose When exiting the water into a boat especially. In our club we typically let the boat sitter lift our gear into the boat. But generally im not a fan of not being able to exit the gear in an emergency. Its one of the luxuries of BCDs.

[@djsalose]

@@sbird7251 "if it only makes it easier on the surface you should not do it" :) A joke but still, you should never compromise your safety during the dive for convinience before or after the dive, Me personally have it so it wont fall of if the buckle is opened.. Should it open by mistake and I close it without knowing the crotch strap is not there i have a very big entanglement risk.. And in emergency you always have your knife.. Just cut the webbing..

[@sbird7251]

@@djsalose Thanks. Seems to be different messaging for OW vs cave divers (Im both). I recall from my OW days (and my sons recent OW course) the importance of being always able to drop weight and exit gear quickly. So weight belt buckle never under cumberband or bcd buckle. Guages never clipped to far side of bcd. Everything removable with just left hand. But in cave diving we encourage a less releasable set up for the opposite reason. Problem is i dive hogarthian in ocean dives and a deep water exit is often necessary and if its really rough, getting out of the gear quickly and cleanly is a god send. Or if the person im diving with isnt trained on twins, im pretty sure they will be at least temporarily stumped if the crotch strap is trapped while rescuing me. Most people here don't carry a knife on OW dives, and using a knife close to someones crotch by feel alone would be daunting for OW divers and lose valuable time. So why do i dive full cave setup on OW then? To stay familiar for the rare cave dive.

[@BurhanMuntasser]

The annoying background music was too loud that made it difficult to actually hear what you were saying and often you were unintelligible, annoying to say the least. Also, you seem to have the camera microphone too far away from you creating some echoing effect making it difficult to hear what you were saying and sometimes one can't understand what you were saying at all (the background music didn't help either). May I suggest that you turn down the background music to less than half of what it was in this video, getting rid of it is best actually, and use a wireless microphone that you can clip to your shirt for better sound please. I like what you are doing and I really wish you the best of luck and success in your most valuable effort here.

[@waynemartin5247]

That audio is horrible, I can't watch the video because all the noise distortion. Only got up to 1:24

[@markeletr]

Dear God, can you please re-cut this without the music? Your content is great, but this is almost impossible to watch.