I'm just plumbing in a replacement shower tray as part of my en-suite
The old push fit waste pipe has been removed from the push-fit connector on
the soil stack and was a tight fit. The new 40mm pipe courtesy of Homebase
slides in much easier and I suspect may not be good enough to be water
tight. It appears on inspection the old pipe is a slightly larger diameter.
I've changed the seal in the soil stack for a new one of the same type
(borrowed from a 40mm external grade compression joint) with no improvement.
Now there are two obvious solutions I DON'T really want to adopt because the
soil pipe and shower waste pipe is going to end up behind a tiled stud wall
until it gets under the shower tray.
1. Use a section of the old pipe into the soil stack and an in-line
compression joint to the new pipe. The compression joint due to the position
of the old shower would end up being well out of reach for any maintenance.
2. Just clag the joint with sealant. Again, it would need major open wall
surgery to get to to it if I ever need to pull the pipe back out for any
The way I'd prefer to approach this is:
1. A way of PERMANENTLY jointing the two types of pipe. I'm currently
considering whether a 40mm solvent weld coupling will do the job (old pipe
may not fit in + I think the pipes need to be ABS for it to work?) and no
experience of the life span of the flexy couplings of the type screwfix do.
2. Fitting an oversized seal if such a thing exists (tried to improvise one
yesterday from a compression joint seal but no luck so far......)