what van you got i have a combo and i can get mine it ok - slots in over the passenger comp. and leaves 3 inches at rear by doorsDarran
cut a bit out of the pipe underneath...let brush hang out..then put push fit on..i would change it to screw on..for easier access
go to your local plumbers merchants they will have better stock than the likes of b&q and cheaper aswell... soil stack fittings you want
call into your local plumber merchant..wolseys...plumb centre if they dont dont have one in stock they could order it in.i worked in plumbers merchants thats how i know the fitting your looking for
dont think they have different names but a different maker....hepworth was the maker and supplier in my daysive never seen the one you have before...how you fit it depends on the end of soil pipe ..if it has a rubber in side. its a push fitif it hasnt it its solvent weld ..thats putting a glue in it that melts the two togeathersorry cant help you any more..except go and get you one and post it but would take a few days as iam in belfast
do you want me to get you one