I'd wonder about the fittings leaking.

Christopher A. Young
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"Ralph Mowery" wrote in message
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I don't know about PEX, but some plastics will let gas pass through it. The
2 liter and like Coke bottles will let the co2 out. If you look at a bunch
of them in a store, some will seem to have more it them than others. The
ones that look fuller are the old ones.

Also ,what is the pressuer ratings of PEX ? It may be too low.