Oh just a thought,if its for condensate from a boiler then its not allowed.
Not mine Still ok since 1970`s ...no sign of leaks on the soilpipe . Good old hemp grommet and silicone . Yet another of my craftsman`s jobs . At the back of a shop in Uckfield if you`re interestedRegarding using a plastic boss onto CI, most will go on to leak. .
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