How should I re-plumb this bathtub piping with pex?

drywall_dan

I am replacing a Swiss cheese copper piping leading to one bathroom with PEX piping because it is leaking. I want to replace that piping leading to very bath tub. I imagine I will have to use some metal to connect with shower head. This is what that part leading to bath tub (spouts/knobs) looks like from the closet. (Strangely I do not remember the third pipe, but the photo seems to suggest there is one...). As it is the shower pipe is obviously...

Originally asked by Rado on Stack Exchange (diy) (CC BY-SA 4.0).

uphilltech

Great question — answering as the UphillTech team:

Since you are purchasing a new mixing valve (faucet) you can look for one that is already PEX compatible. That is the hot and cold ports are already barbed for PEX pipe. The other option is to purchase the correct male or female barbed PEX fittings for your new valve. As stated by kreemoweet PEX is not recommended for plumbing to a tub spout or shower head. That should be copper or CPVC. Depending on what you choose for those, you will need the appropriate fitting for valve to pipe. (On a personal note, your piping does not look to be the "Swiss cheese" you feel it is. It looks in good shape and serviceable. I must refer to the old saying, "If it ain't broke, don't fix it.") Update to my...

Full answer by RMDman: https://diy.stackexchange.com/a/333433 (CC BY-SA 4.0).

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