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Screwfix only has pipe bosses for connecting to 110mm pipes. I need one to connect to an 82mm pipe.

Can someone please advise me how to go about connecting this boss to 40mm compression waste pipes? The existing shower and whb waste looks like 40mm compression fittings. I think this is the boss I need - its the "82mm Soil Patch Boss 40mm" from Drainage Online...

The Marley 82mm waste pipe I need to fit the boss onto

Close up of 40mm waste

I have two floors of an old Victorian/Edwardian townhouse, where I have a bathroom on each floor. The waste pipes run up the corner of the building, and to allow for this one of the joists terminates in a small joist at 45 degrees to the other joists. Seen here: There are several issues...

This the shower waste from the upper of two bathrooms. 225x75 joists have only 80mm of depth remaining after notches were cut!

Two 225x75 joists with notches 65% of depth