I have used CPVC and pex. The issue with CPVC is it gets brittle after a few years. It doesn't take much to break it. I quite using it a few years back and went to pex. I have only had one issue with pex. Pex isnt made for high temperatures. I wouldn't install it on any lines that the temperature will exceed 150°F. Also never install pex in direct sunlight it will break it down.

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