Relocating a sink on the perpendicular wall: any cons against running ABS through the walls back the the old drain?

Question

I am relocating a sink from one wall to the perpendicular wall and I want to know if there are any potential issue with this
I am wondering if instead of breaking the floor I could do this:
just run ABS across the walls (1) back to (2) which is the existing plubing for the old sink
It is too tedious to create the traps in the diagrams but assume they are there

this is the new layout (please ignore the green pipe you see at the left of the picture)

Kuba hasn't forgotten Monica · Accepted Answer

Of course you could, but read the applicable code: your run is very likely too long to be unvented. You'll need to vent this - run another dry vent pipe higher up and tie it to your newly proposed "white" vent stack.

Correct answer by Kuba hasn't forgotten Monica on August 4, 2021

Relocating a sink on the perpendicular wall: any cons against running ABS through the walls back the the old drain?

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