Kitchen Sink Waste Sorted - How To Fit A New Sink Waste And Trap

How to fit a new kitchen sink waste and dual inlet appliance trap to connect up a washing machine and dishwasher.
I used these parts:
McAlpine Sink Waste and Overflow - Screwfix P/N 77838
www.screwfix.com/p/mcalpine-s...
£7.33 - Feb 2023
McAlpine Sink Trap with Twin Nozzles - Screwfix P/N 95241
www.screwfix.com/p/mcalpine-a...
£14.27 - Feb 2023
McAlpine Flexible Connector - Screwfix P/N 43713
www.screwfix.com/p/mcalpine-f...
£7.69 - Feb 2023

[@SebastianLondon]

Massive thank you for the clear video! I needed to replace just the sink waste, so I purchased the one you linked, it looked exactly the same, but it wasn't exactly the same, BUT I managed to make it work: The metal basket's rim was a tad too large to sit flush in the dip, so I reused the old one, trimming the white seal to size and using the new screw. The overflow thingy ( didn't catch the name) didn't come off as it has been glued with some tough sealant. I did replace the overflow pipe itself with the new one. The sink waste was shorter than the old one, and I thought it was going to be a nightmare to screw it back in place, but it wasn't at all as the pipes have an OK play to adjust to the difference. Now everything is working just fine with zero leaking. Thank you so so much, I have learned something very handy. The only downside is that it is a stinky job 😂

[@handyman-at-home]

Glad it proved helpful 👍👍I know what you mean about a stinky job ... I'm currently putting off cleaning out the waste on a hand basin as I just know it's going to be a real pong !! Cheers, Chris

[@hajg1554]

Great vid pal, saved me a heap of trouble

[@handyman-at-home]

Thanks!

[@jackiewatson5665]

Excellent vid! 👍🙌⭐️

[@handyman-at-home]

Thanks!

[@claudiojunior9618]

No gradient on that waste pipe. They are not meant to go upwards.

[@handyman-at-home]

Fair comment Claudio. Since shooting the video I've raised the waste trap up by about half an inch or so (it wasn't up as far as it would go), so that's reduced the 'incline'. The only real solution is to punch a hole through the wall lower down and re-route the waste pipe, but that wasn't going to happen late on a Friday night :-) It's another job on a long To Do list .... Cheers, Chris

[@munkules4386]

Excellent

[@handyman-at-home]

Thanks. Cheers!

[@darrellfoster489]

looks like the waste is running up hill out to the outside wall

[@handyman-at-home]

Thanks Darrell. See earlier comments below. Has now been sorted. Cheers, Chris

[@MrDaiseymay]

This looks similar to mine, but it has a air vent on top of the left side Pipe top, near the tightening ring, which is leaking, and I can't get a replacement, so Isealed it up BUT. it now takes longer to empty the sink, and makes a loud gurgling noise.

[@LouisTolston]

Are you able to use these fittings in the USA?

[@aledhughes1796]

On my sink the overflow pipe connects to the waste pipe coming from sink but water keeps coming out where the overflow pipe fits over. There’s an o ring washer there and I pull the overflow pipe over but after running water few drops still come through. Do I need to replace the overflow pipe? Or that and the waste pipe?

[@handyman-at-home]

Hi, It's a bit difficult for me to visualise your setup but it sounds like water is getting past the o-ring washer or seal??? Is there any way you can check whether the o-ring is in the correct position and isn't damaged? Good luck. Chris

[@aledhughes1796]

@@handyman-at-home yes water is getting past the o ring. I’ve replaced the o ring same thing happens, it sits in a little groove and then the pipe goes over that

[@gored6248]

May sound like a stupid question, will the dishwasher water not run back into the dishwasher as the pipe is raised?

[@handyman-at-home]

Hi, Not a stupid question at all👍- it's a fair observation. I've answered similar comments before, so have just copied one of those here ... The existing waste pipe outlet through the wall was already in situ and to change this would require drilling a new hole through the wall lower down, and re-routing the waste pipe. This wasn't going to happen late on a Friday night, so it got put on a long To Do list, for another time (and has since been done). The video footage was also slightly misleading in that the lowest point of the waste pipe was actually just lower (but I agree not by a lot) than the lowest point of the connections to the washing machine and dishwasher. Since shooting the footage I also raised the waste trap up by about half an inch or so (it wasn't up as far as it would go), so that further improved the situation. Dishwasher's been working fine for over a year now. Cheers, Chris

[@nickclist5756]

That’s just going to drain your sink into your washing machine and dishwasher! The waste pipe should be the lowest not highest point.

[@handyman-at-home]

Thanks Nick. The photo/video is possibly slightly misleading in that the lowest point of the waste pipe is just lower (but not by much) than the lowest point of the connections to the washing machine and dishwasher, so we've not actually seen any evidence of 'backflow'. However I agree the original position of the waste pipe is too high, and as per my reply to Claudio's comment, re-positioning it is on the To Do list.

[@sheerkhan7589]

how much would you charge to do a job like this ??

[@handyman-at-home]

Hi, Just replacing the sink waste with a new one shouldn't normally take more than an hour or two at the very most, depending on whether you hit any snags. A straight like-for-like replacement could be done in a lot less time... I used to charge £25/hour for handyman work (with a minimum charge of £20) but I'm retired now 😊 Cheers

[@sheerkhan7589]

@handyman-at-home thanks for your reply, much appreciated . videos are helpful

[@mightyconker3903]

I struggle to understand why a seemingly instructional video is made of fitting a waste pipe going uphill..

[@handyman-at-home]

I struggle to understand why people are so quick to be critical and blast off a one line put down .... The purpose of the video was to demonstrate fitting a new sink waste and trap, specifically to facilitate washing machine and dishwasher connections. The existing waste pipe outlet through the wall was already in situ and to change this would require drilling a new hole through the wall lower down, and re-routing the waste pipe. This wasn't going to happen late on a Friday night, so it got put on a long To Do list, for another time (and has since been done). The video footage was also slightly misleading in that the lowest point of the waste pipe was actually just lower (but I agree not by a lot) than the lowest point of the connections to the washing machine and dishwasher. Since shooting the footage I also raised the waste trap up by about half an inch or so (it wasn't up as far as it would go), so that further improved the situation. We can all be critical of others efforts ...

[@AlexRocks24-7]

This is wrong on all levels 🤦😞🤬

[@handyman-at-home]

Seems to have been working fine for around 12 months ... so maybe not that wrong... If you're concerned by the level of the outfeed pipe, please see earlier comments and answers. Thanks