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Yes the kitchen is above. Kitchen sink drain goes through floor and connects to the upper wye branch which terminates in the basement wall as shown in the photo. Regarding the venting of the kitchen sink, a cheater vent is used inside the sink cabinet. So as a previous poster noted, that drain...

Thanks for the reply. I assume you mean it’s impossible to tell “what each pipes purpose” WAS originally? Because I can confirm that the lower 1.5” pipe is routed out and up the side of the building, and that the upper 2” pipe is routed from the kitchen sink. And that the place has been...

I’m replacing some dodgy pipes under the kitchen sink, and I’m noticing that where the drain line meets the basement wall it appears that the vent pipe is below the drain pipe. In the attached photo, the relatively horizontal 1-1/2” pipe below is the vent and the 2 inch pipe pointing upwards is...