billythekid
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plastic waste is funny stuff when sizing, you need all the same fittings and pipe for compatability really. Some pipe was measured O/D outside diameter, which has become the norm. other pipe, lead and some early plastic for example, was measured internal diameter. both are 32, or inch and quarter, but neither fit each other! Renew the run in 32, solvent weld or compression, i dont generally recommend push fit coz its a slightly different size again, and makes it difficult to work on in future. what kind of stack is it? if its PVC all you will need is a boss adapter in 32, if its cast, dig out the old joint and rope and putty joint it. others have other opinions on joints to cast but thats my personal taste. Since its 15 year old im guessing that its probably plastic. The general answer to your question is yes, you can get a 32mm adapter for pvc, either a strap boss with a boss adapter or a branch again with the 32mm adapter. hopefully you can just go in where the old one was with a new adapter if needed. More info on the connection might help.
Hope this sorts you out
btk
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