copper (and even smaller with fittings). If you're tearing out copper and replacing it with the same size PEX pipe, the water ...

You often must tie together pipes of different materials with transition fittings. The materials in common use today — copper, PVC and CPVC, PEX, ABS, galvanized steel and cast iron — can ...

That's a bit of a problem if you're trying to attach a PEX pipe to certain fittings and the pipe doesn't fit. It may be flexible, but it's not so flexible that you can expand the opening with your ...