


I have a leak where this smaller waste pipe connects into the soil stack. The previous owner had just stuck a load of silicone sealant around it but this was even leaking. I removed all of the sealant and cleaned everything up but no matter what it still leaks.
It seems to leak worse when the toilet is flushed. Is it the boss adapter just needs replaced, or is it a design flaw somewhere?
I’ve attached a generic picture of what the rubber adapter looks like.
Thanks.