Another "what fitting" plumbing questions (waste)

[ProDave]

I have a number of 40mm and 50mm solvent weld pvc pipes to fit into boss adaptors. I have previously used the "rubber bung" type adaptor but people on here seem to say bad things about those.  Trouble is, I can't find a solvent weld fitting to allow a 40mm or 50mm solvent weld pipe to solvent weld to a boss.

 

[PeterW]

Need one of these 

 

https://plasticsuppliesdirect.co.uk/polypipe-40mm-solvent-soil-boss-adaptor-grey.html?gclid=CJyggMGkmtQCFSEW0wodmZQJtQ

 

solvent weld it into the strap boss and onto the pipe where you would normally do a rubber bung fitting. 

 

They have to be lined up perfectly though or they can leak if you misalign them.