Your subject line mentions p-trap and that would be cast iron (or
brass?) not steel, unless you're talking about an under sink p-trap which
more than likely would still be brass or chrome-plated brass.
What exactly is your situation?
The quality of the brass does change through time. Brass is mixture of
One being lead. Almost all building materials were better in the
At the present, and in the sixties, we have two thicknesses of brass
The thiner walled p-trap is 20 gauge and the thicker is 17 gauge.
17 gauge last for many many years. Thats why all commercial jobs
require 17 gauge.
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