On 23 Dec 2020 at 15:57:25 GMT, ""Dave Plowman" News)"
wrote:

In article ,
Tricky Dicky wrote:
I have a situation where I have isolating valves and check valves with
compression fittings in close proximity and keep getting a slight weep
tightening the compression fittings simply causes problems with the next
fitting as tightening it loosens the one below

You need to stop pretty well any compression fitting from turning when you
tighten it.

If concerned about the bit of pipe between two compression fittings turning,
tighten on of them until it doesn't turn when you tighten the other.

--
Roger Hayter