depends on what your health department wants as it applies to your type
of building and its use. our county wants pvc, less unnoticed rust-thru
for contamination of home.
of course, our city, buffalo ny, wants metal.

Eigenvector wrote:
Generally speaking, which is a better long term investment, a non-corrodable
metal P-trap or a PVC P-trap? I thought I heard someone mention how PVC was
prone to clogging.