pvc to copper plumbing connections
#1

What is the best way to connect new pvc fixtures ( shut off valves to copper pipes?
#4

If it's in an easily accessible place (such as sink or toilet cut-off valves), a compression fitting is fine.
If it isn't (under the house, in a wall), for the best and longest-lasting transition fitting, I would sweat on a male copper fitting, wrap 2-3 flat turns of teflon tape clockwise only around the threads, and screw on a PVC adapter, and glue-on from there.
Depends on where it is.
Your local code may not permit a compression fitting in a wall, etc. anyway (and you don't want one in a wall).
Good Luck!
Mike
If it isn't (under the house, in a wall), for the best and longest-lasting transition fitting, I would sweat on a male copper fitting, wrap 2-3 flat turns of teflon tape clockwise only around the threads, and screw on a PVC adapter, and glue-on from there.
Depends on where it is.
Your local code may not permit a compression fitting in a wall, etc. anyway (and you don't want one in a wall).
Good Luck!
Mike