Soil pipe coupling help please!

jammiebodger · 11 Jan 2021

Hi all,

Whilst gutting a bathroom I found a leaky soil linkage. It was an odd connection using multiple diameters.

I’ve removed what I can and am left with this sleeve section. I’ve removed an inner seal from the rib. I think this is another old adaptor?

It measure 50mm at the opening then narrows slightly. You can see the lip at the back.

I’ve tried fitting a 50mm rubber boss which does just sit in the opening but 40mm just won’t go in and is nowhere near fitting (I’ve tried the usual tricks).

Any idea what this section is? How best to marry this with 40mm waste? Or do I need this section out?

many thanks

Hugh Jaleak · 11 Jan 2021

Old boss fitting, I very much doubt you'll be able to reuse it, even if the seal was still in situ. I also doubt you'll be able to couple anything onto it, so best option, PITA as it may be, will be to replace that section.

jammiebodger · 11 Jan 2021

Cheers Hugh,

Is lifting the stack and taking this section out doable for a moderate DIY’er?

thanks again

Hugh Jaleak · 12 Jan 2021

It's easy enough to do, if you can get access to the stack. Will happily talk you through the process, how difficult is it to get to somewhere above and below that fitting?

Nige F · 12 Jan 2021

jammiebodger said:
Hi all,

It measure 50mm at the opening then narrows slightly. You can see the lip at the back.

I’ve tried fitting a 50mm rubber boss which does just sit in the opening but 40mm just won’t go in and is nowhere near fitting (I’ve tried the usual tricks).

many thanks

If you cut the end of the boss off ( the bulge ) then you may get a fernco rubber adapter to fit - (just advised a M8 with similar sized pipe ) That 110mm wc branch is solvent welded @ the bottom

best left alone if poss.

jammiebodger · 12 Jan 2021

Cheers both,

guess I’ve got nothing to lose by messing with the side branch.

access above is ok, as it’s all exposed anyway. Below is tricky, soil runs into a boxed section in the kitchen, behind tiles. I can’t see any fixtures in the loft, the very top of the stack is wedged into the loft/eave and doesn’t look easy to get to.

the lower joints are visible from here tho. I might be able to get my paws on them if I lift a couple of floor boards.

please ignore the flexible waste pipe fudge!

Many thanks both for the pointers

Hugh Jaleak · 12 Jan 2021

Good call Nige, didnt realise Fernco went down to that size. Handy to know.

HERTS P&D · 12 Jan 2021

https://www.mrcentralheating.co.uk/plumbing/plumbing-fittings/flexible-couplings

Andy

jammiebodger · 13 Jan 2021

Cheers gents,
Have ordered a 63mm to 40mm coupler, will have a play and see,
Thanks again

Hugh Jaleak · 13 Jan 2021

Let us know how you get on please. Always a useful reference for future posts, there's probably thousands of those type of Boss left up and down the country, as people come to change their bathrooms, they'll come up against the same issue as you have....

jammiebodger · 14 Jan 2021

Ordered from that popular ordering website.

I left the boss alone, didn’t cut the rib out, fitted over easily.

looks like it’ll do the job, will go around the edge with silicone too.

never before did a £12 piece of rubber make a man so happy!

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Soil pipe coupling help please!

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