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I am replacing a shower faucet. The previous install soldered the copper to the shower valve but I am considering using threaded copper in case I ever need to replace it. What are the pros and cons of each type of install?enter image description here

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    When soldering the new valve make sure you disassemble the new valve so you don't ruin the internals from the heat used to solder. – d.george Sep 1 '17 at 20:27
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In all my years, threaded or soldered, I've never replaced a valve with the same valve, and definitely not with the threaded connections. If you think about the logistics of unthreading a shower valve to reuse the connections, you'll see what I mean.

I've come to the conclusion that the threads are for convenience of installation, not re-use.

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    And to really make it replaceable he'd have to include unions in the connecting pipes, which would complicate things, and potential leak points. – Mark Sep 1 '17 at 16:25

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