The plumbing under my kitchen sink has all metal parts. The nut which
connects the waste pipe to the J trap/gooseneck has pretty much come
apart and is leaking. Also, the bottom part of the waste pipe looks
Is it advisable to replace just the waste pipe and trap with PVC
plastic parts, or do I have to replace everything from the bottom of
the sink to where it empties into the main drain pipe in the wall with
either all plastic or all metal to assure a good fit?
That hasn't been my experience with mixing and matching. Gaskets, ring
nuts, tapers, etc, look like they fit, but produce leaks. I usually
leave the pipe coming out of the sink drain as metal if it is in good
shape (Because those are a pita to remove), but switch everything from
there to the threaded fixture in the wall, with plastic, ideally from
the same manufacturer. It's cheap, and I don't ever want to have to mess
with it again.
And like it says on the package, make sure to deburr any end cuts you
have to make on the plastic- burrs attract clogs like mad.
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