Just wondering if there's a reason why. I'm currently replumbing my house with PVC, and in the middle of a bathroom remodel. I've never worked with copper before, not that I couldn't, but would be easier to just use PVC.
There are advantages and disadvantages to each possibility. PVC is fine for cold water but you must use CPVC for hot as kenmac says above. I use CPVC for both hot and cold. Using both just does not make sense to me. Running CPVC to the shower valve is fine. I always use copper and a brass lug ell for the shower tube but the do make a brass lug ell for CPVC also. You will need it to attach the part the shower arm screws into to something solid.
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