40mm compression fitting, an elbow, keeps popping off, but I cant find
anything wrong with it. It gets done up firmly each time, but still
comes off. The only thing I suspect about it is that the pipe that
comes out is restrained about 8 feet away, so perhaps it pushes
sideways (not in & out) in the compression fitting when it warms up.
That's really the only idea I have. The fitting is most likely from
screwfix, toolsatan or wickes.

Any ideas?


NT