"Red" wrote in message
...
On Nov 25, 8:08 pm, HerHusband wrote:

First, NEVER thread a male metal fitting into a female plastic fitting. The
plastic fitting will crack or split everytime. I don't think female plastic
fittings are even allowed by code, even though they are still sold in
stores.

The best way to transition between copper and PVC is to use a dedicated
transition fitting.

Been to Lowes & HD and neither one has copper-to-PVC transitions of
any type. Lowes department manager said they don't even make one.
Found unions & transitions for copper-to-CPVC, but zip for PVC. Can't
figure out why unless the schedule 40 fittings are much stronger than
CPVC and don't require a special connector. Lacking any additional
input, your "no other option" may have to apply.

PVC male threads into copper or galvanized work fine in most cases. I have had
OK success with metal into PVC female threads also, but I wouldn't do it in a
behind-wall installation.

I think that CPVC might be more of a problem because hot water softens it.