hole in soil stack

[stevec000]

hi guys,
will explain this the best i can, i have a hole in my soil stack
it is in a section with an entry for a wc and sink ,but its at the back , its quite large as if someone started to put a boss kit on then changed there mind. this is in the down strair bathroom so evert time we shower or flush up stairs 10% of waste is excaping ..how easy will this be to replace of fix myself access is limited at the back i cant even see the hole only feel it
cheers

[HowardKennitby]

plastic or metal pipe?

[stevec000]

sorry its plastic

[The Builder]

If it was for a WC, Steve, is it about 100mm (4") diameter?

[Old_Geezer]

You have the experts here, but in your shoes I'd have gone to the local DIY sheds to see what fittings they had. I'd have thought a piece of pipe and a couple of joins should allow you to saw out the holed bit, and reconnect again. May need some gunk of some sort to seal it all.

[stevec000]

the holes about kithen sink waste size and i cant just cut it out as its at the same hight as my wc and sink waste

[The Builder]

Og's quite right. Just cut out the piece with the hole, and cut yourself a replacement piece. Cut it so that it fits loosely between the two ends.
Buy a couple of "slip couplings" ................

http://www.raygrahams...LiC9LACFdIRfAodqH6C3Q

Slide each one onto each of the cut ends (slip couplings have no central stop, so they can slide up the pipe on the one that comes from the ceiling.......... and down the pipe that comes out of the floor.)

Position the new piece........... then slide each coupling into place. Use plenty of silicone spray or washing-up liquid to lubricate the rubber seals.

[The Builder]

Cross-posted there Steve, OK.

In that case, you need a "strap boss" ................

http://www.screwfix.c...trap-boss-sp319/49547

Buy a rubber insert to fit inside the boss................ and a stop-end waste fitting. The strap boss is glued into place with ordinary solvent weld glue.

[stevec000]

thought of that but for one prob ..because the wc waste is at the other side how do i tighten it up?catch 22 i think..

[The Builder]

Do you mean the hole is on the opposite side to a WC branch?

[stevec000]

copy and paste to screwfix 92.5° (87.5°) Branch Grey SP190
my hole is oppisite the wc waste

[The Builder]

Ok ................. simply cut the "arms" off the strap boss, and glue it over the hole with "gap-filling cement".
Go to a plumbers merchants such as PlumbCentre. They'll know just what bits you need :o)

[stevec000]

never even gave that a thought will let you konw thank builder

[The Builder]

You're welcome, Steve.......... by the way, they did used to make an glue-on strap boss without the "arms"......... you might find one of those. :o)