"Peter" wrote in message
...

"Nodge" wrote in message
...
Just been doing a bit of plumbing in the bathroom. I've fitted a 15mm
isolator valve in the feed to the wc. I suspect the copper pipe is the
old
imperial 1/2" dia but I understood that the 15mm fitting would be ok.
I've
tightened the nut on the isolator valve as much as I dare but I've still
got
a small leak. It seems to be coming from between the pipe and the nut
rather
than from the threads of the nut. (I put PTFE tape around the thread).
What's the best way to get a watertight seal?

Nodge


Did you use PTFE around the olive ?



No, I only put the tape on the thread. I'll try unscrewing the nut and
putting tape on the olive. I would think this would only give a seal between
the mating surfaces of the nut, valve body and the olive. I suspect the leak
is between the olive and the copper pipe.
Nodge