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It does rather look like the tape is overdone on the fittings, the problem with putting it on fittings is that unless it is done well it can partially block the pipe, come loose and cause blockages, hotspots elsewhere.
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Following a recommendation from @Airhead I went with this stuff rather than tape on joints. It seems to work well
https://fernox.com/product/ls-x-external-leak-sealer-50ml/
freezing77
aggi
@lf
ok, done. didn't have any waxed string or similar so went with ptfe, let's see how it holds up.
every single part of this valve now has ptfe on it... i feel like i've read somewhere that compression nuts shouldn't have ptfe