On 09/11/2019 15:37, Tricky Dicky wrote:
I cannot quite picture your arrangement but if you are connecting
your flexible tap connector directly on to the isolator valve then I
am not surprised you are experiencing leakage problems. The isolator
has connections that involve the use of an olive to provide the water
tight seal the end of the thread has a chamfer on the inside to mate
with an olive whilst the very end does not have a flat surface to
mate with anything tending to be rather sharp too.

Conversely I always use a normal full bore service valve with the
backnut and olive removed to mate with the flexi connector, and have
never had a leak. So long as the end of the valve is smooth and
continuous, then it should seal against the flat washer. A narrower
cross section just means it will seal with less torque.

I think in the OPs case I would replace the flexi.


--
Cheers,

John.

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