My loo cistern has a plastic ball valve assembly. It is fed from a
> copper pipe. The joint is now leaking. Tightening the join doesn't fix
> it. Reassembly of the joint has made the leak slightly worse.
>
> What does the team think is the likely cause? Suggested fixes?
>
> Thanks!
>
> Steve at netservs dot com
Turn off the supply. Remove the brass nut from the plastic tail. Wrap the tail with five turns of PTFE Tape to build up the thread again. Replace the brass nut on to the tail. Not to tightly, as this will strip the thread again. Make sure the brass nut is on the proper theard and not cutting across it. Then turn the water back on and check the seal.