"Very useful item that makes the fitting of pipework to the soil stack boss very simple. Easier and quicker to use than alternatives (solvents). I cannot comment on long term reliability, but no leaks after a month since being fitted. Rather pricey (even the staff commented on this!) and only available in packs of five from Screwfix. I've some spares if anyone needs them!"
"Better with solvent adapters which afaik screwfix don't sell. These do the job but the pipe can be pulled or knocked out if not properly fixed or clipped. Ok if you are stuck but not a choice product."