"Simon \(Dark Angel\)" contact me through my website wrote in
:

On the water supply to my toilet cistern there's a 15mm ballofix type
isolating valve. One side is a 15mm compression fitting, which goes
onto the copper pipe. The other is a 1/2" female screw fitting, which
screws onto the threaded connection to the cistern ball valve, like
the one in this pic...

http://tinyurl.com/ya22ztv

Problem is its started leaking from 1/2" threaded end, where it
connects onto the ball valve fitting.

I replaced the fibre washer, it still leaks. Tried putting thread tape
around the threads on the ball valve fitting, it STILL leaks.

Also, it seems to leak worse when its done up tight than when its
slack.

May seem like a simplistic question, but how the hell do I cure this?
The two things I thought would remedy this haven't worked. Am I doing
somethign wrong? Should I just slap "Plumbers mait" compound all over
the joint and hope for the best?

TIA



A) Check and check again that the threads have not crossed.

B) Ckeck that the leak is not in fact coming form the cistern to float
valve union above it.

C) Plumbers Mait will not cure the problem but there may be other leak
sealers available that could do the job.

D) Check the the threads have not crossed.

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