woodyi
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Great forum. My basement was roughed in (unfortunately) only with drains for a sink and water closet, with a vent stubbed down from the first floor. I need to add a drain for a tub. Is it OK to set a side-inlet sanitary tee on the 3" riser for the water closet (just below where the closet flange will be), and run 2" to the P trap for the tub? I would plan to re-vent the 2" between the WC and tub drains, and also connect the vent to the sink. Or must I uncover the horizontal drain which runs to the water closet and tie into that? Thanks for any help.