I had the chance to look up the wall at a galvanized vent which drops down to the first floor.
I was surprised when I cut it on the first floor that some rust dropped out. It must have been from farther up the line as normally the steel is pristine in the vent pipes. I didn't see rust near where I cut.
What you see in the picture is the horizontal run of a cast line which receives the closet bend, the bathtub and the sink waste from the second floor bath. The galvanized vent in question...
Trouble brewing on waste line?
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