[oil pan 4]

There was steel pipe for a long time, those rust and split when frozen, then copper was the much more expensive alternative, it still splits when frozen but usually after multiple freezes, then there was bpv I think it was the name or bpvc something like that, this stuff would split/fail for no reason. Then pvc, it lasts a long time, but first time it freezes it shatters, now there's pex, it doesn't care if it freezes, if you use elbows or couplers those could push apart or split, but the straight runs of pex, just swell when they freeze and don't care.

I like copper because it builds up an antibacterial pitena after enough years, but the cost, speed of install, ease of install and freeze resistance of pex is hard to argue against.