I used the L stuf for my air compressors line system sweated with good old 50/50. Routinely gets 120 or so through it with no trouble at all. Same with the water syste. I have it in lots of places and its never leaked a drop and I have the well pump jacked up as far as I dare, around 65 PSI. With that in mind I wouldn't run out and replace it in a panic. While I have hated plastic soundly for most of my life it certainly does have its place to shine. Plastic fenders on cars are better in every way and double that in the rust belt. I replaced that chit Smith &Wesson 686 hand cannon the govt issued me as soon as I could with a nice light Glock.. No more bruises on my hip or any of the other nasty painful issues of toting the steel beast. Give me a plastic gun any day if I have to carry it. When I think back that I had to carry that nasty Colt .45 once upon a time I cringe. About all it was good for was diggin under my ribcage and opening beer bottles. Coourtesy of uncle sam I have blown my glock 23 .40 cal due to some double loads they got from the factory. All that busted was the extractor and that beast bucked like a >44 Magnum. Since then I had a couple more find their way in there from my saved stockpile. No damage whatsoever, now thats strong plastic. Proves they can make good durable plastic when they want to.