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George E. Cawthon

wrote:
Does metal have any
benefit over PVC? Maybe appearance when exposed.

You not likely to strip the metal threads.

True but one shouldn't strip PVC threads if one
realize that there is virtually no pressure inside
the pipes so hand tightening even if you are weak
is all that is need. Even with care PVC nuts can
crack and require replacement after a long
period, but the crack should be obvious long
before a leak develops. Unless one is an idiot
and uses one of those pressure devices to clear clogs.