Please help. I have just tried to fit a new syphon to the loo which was going fine till I tried to reattach the water inlet pipe to the plastic inlet. I can't get it to stop leaking from the joint. I have used the same fabric washer as before. The inlet pipe has an isolater so dont want to change it. Would using ptf tape help, although I think this is just for metal to metal. Gizzy333