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Thanks for the reply. The 3" pipe is not the vent, the vent runs up at a different location, if that makes a difference. And venting the kitchen sink separately is no problem as the addition will be one story. The drain does not drop down directly from that point. It runs horizontally...

Planning a kitchen remodel that includes bumping out an exterior wall. House is slab on grade, Dallas Tx. I knew about the 2" drain on the right, but was surprised to find the 3" drain on the left- the pipes are identified in red on the drawing below. The 2" drain currently serves the kitchen...