Hi again Ian. I changed my all brass fitting that had to be well spanner tight for the rubber dome when I fitted the lightweight ally bottle, it has a large red thumbwheel to hand tighten. I would think if yours has the rubber dome and the hex spanner end fit as tight as you can by hand and then nip it up with a spanner. don't over tighten it in case it damages the rubber, check for leaks, I use a couple of drops of washing up liquid in a mug full of warm water.
deanjay.
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