Huaco
Well-Known Member
I am mounting my 1/2" O.D. HERMS Copper coil with 1/2" O.D. Compression fittings. How tight do I need to tighten up the compression side of the connection? I have tightened it down till I heard metal squealing and the coil still moves in the compression nut. (if I wriggle it) Is some movement normal for compression fittings or do I need to lube the threads with some veg. oil and keep compressing the fitting?