Pricing out O2 barrier Pex, should I also...?
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All Metalic fittings will not transfer oxygen. All plastic fittings that I know of are Not for heating and I don't think are oxygen barrier. I wouldn't use the plastic fittings on your heating system anyways.
Yeah, I see plenty of brass and copper that are avail. But I also came upon some by a company called ProPex on a couple of websites. Then there are also manifolds and such that are premade. Some of these have pex in them. But none of them seem to differentiate if they are barrier. Guess I should quit overthinking things and just go w/ the brass or copper fittings. Keep it simple, eh?
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ProPex is a trade term by Wirsbo/ Uponor for their expansion-ring type fittings, and they have those fittings in both brass and fiber-reinforced plastic. I've used both the brass and plastic in my domestic plumbing, and they all seem to work well, although I do not know the oxygen-blocking or transmitting characteristics of the plastic. Regardless of the 02 issues, I would sleep better using all PEX and metal in a heating loop, rather than plastic-PEX elbows, tees, and manifolds, unless I saw specs from the manufacturer that said that the plastic-PEX fittings were OK for hydronics
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