House ~1945, full basement and 2 stories. I am replacing a section of cast iron pipe (long story, already demo'd). The waste pipe descends from the 2nd floor to 1st floor (no connections) to the basement in the far left corner in the photo, which is not the corner of the house. In the photo, there is a wye about 30" from the wall, which runs parallel to the outer wall - see red arrow. There is no other plumbing on that side of the house; no basement floor drain. There is an iron pipe cut off...
Does my vent stack wye off of the drain under my slab?
Does my vent stack wye off of the drain under my slab?
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