"Harry Bloomfield" wrote in message
...
Nodge formulated on Sunday :
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?

Copper olives are best used where an old imperial pipe is to be
connected to, copper has more 'give' than the usual brass olives.


That is a good idea!

Another thing to look for is a scratch / groove along the pipe under the
olive- enough to give a slow leak (been there etc).

Don't use PTFE tape on compression joints, a bit of "boss white" or "hawk
white" is OK. Also make sure the mating surfaces are clean and undamaged.

(Oh, and Harry is another radio amateur lurker. This group is full of us!)

--
Brian Reay
www.g8osn.org.uk
www.amateurradiotraining.org.uk
FP#898