I was doing some research last night and didn't even know there was different styles of sweeps (glad I did my homework). The 90 degree bend used is a short sweep 3". It transitions to a 3" vertical drain pipe as pictured which goes to the basement that exits to the street. It ties in a 3" drain line, as well as the 3" vent stack. The upstairs toilet is in the middle of the bulkhead in the top left of the picture. Upon further investigation of some plumbing work done in my home over 30 years ago I became a little curious about the 90 degree couplers used for the drain pipes.ฤก.
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