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We recently installed a new sink, drain, and vent as shown in the drawing. The new drain goes into the 3†drain, the new 1.5†vent into existing 2†vent at 6’ above the ground. That vent extends all the way through the roof with nothing else attached. On the opposite side of this room...

We are looking at adding a toilet and sink in a small closet. The area is on a crawl space and there is an unused closet behind it where I can connect the sink vent and install a 5' tall 3" stack with a 3" air admittance valve. We are also looking at adding a washer upstairs. We thought we might...