Andy Burns wrote :
It needs to be tightened onto the valve body. If pipe comes up from below,
turn the nut from the left to the right a little.

Surely clockwise/counter-clockwise would be better notation that left/right
motion?

Normally yes, but not the way the OP put it. I was trying answer the
question to match the level of the enquiry, leaving out the possibly
confusing terms.

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk