I am getting tired of comression fittings. When I tighten one, it graps the preceding conduit with an offset in it and twists it out of alignment. Sometimes the pipes pull out. Wrenches don't fit very well on them. They aren't really water proof. I know they cost more which may be why they are specified but are they really any better than set screw connectors? ~Peter
I found on some cast ridgid copression in the 1 1/4-2" range the ring inside is too big. If I use large adjustable wrinches and get it as tight as possable the pipes are not tight, will spin, and may pull apart. If I take it apart and clip just a hair off both ends of the sealing ring it works great. When I put the pipes back together BY HAND ONLY I can't even twist them let alone pull them apart. Of coarse I crank it down still. A quality issue I guess. I don't know what it does when the rain comes but keeping the pipes together is priority 1.
#40877 - 08/10/0405:29 PMRe: Are compression coupling over-rated?