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Pulsing water with PEX tubing?

Our home is plumbed with PEX tubing, from what I can tell. When summer started, the shower started running hotter, so we turned down the shower lower and lower. But when we reached a certain place ...
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Are PEX required for shower mixers?

From my understanding it is normal to mount a PEX like this one in the wall. And that it is not legal to have hidden connections in the wall. Question Why are PEX so often used (required)? Is it ...