Hi - I want to replace my sink basket strainer. Can someone advise me what fitting I use at the lower threaded section of the strainer so I can continue off in 40mm plastic pipe and fittings to my existing trap. I've seen the fitting used but I don't know what it's called - basically a plastic nut (or sometimes a brass nut) and a (top hat?) washer. Would a McAlpine T29 fitting be suitable?? - or I've seen trap height adjusters which may possibly be suitable. All advice appreciated.