Forget the max pressure for tubing, PEX, fittings, pumps, faucets, or ANY pieces and parts... the weakest link in this "chain" is the QUALITY OF CONSTRUCTION (lack thereof) and absence of quality control. All it takes is one hastily installed clamp, or installation over a sharp edge, against an OVEN (like mine), or any of a thousand half-a$$ed idiot construction mistakes buried deep in the walls, ceiling, floor, etc... to wreck your day, (or vacation). All in the name of "fast and cheap" .... a regulator might prove to be your insurance... no guarantee, but worth it.
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