enter image description hereLong story short, I ran my bathroom sink drain, which has an AAV, into the toilet drain before the toilet drain vent. So the current drain goes: toilet -> sink (through a wye) -> vent for toilet -> washing machine drain (through another wye). Both the sink and washing machine will have AAVs. Did I mess up? I can still easily go back and fix it.

  • it depends where you live, is the toilet drain separate from gray water drain
    – Traveler
    Commented Jul 21, 2022 at 3:33
  • It is not. Everything goes to the same place. I'm more concerned about venting issues.
    – swordguy8
    Commented Jul 21, 2022 at 10:17
  • 1
    What is the applicable plumbing code for your local area having jurisdiction (LAHJ)?
    – Ecnerwal
    Commented Jul 21, 2022 at 11:24

1 Answer 1


I got in touch with the building inspector. He said it would act as a wet vent, but didn't meet code for a wet vent. I ended up just redoing it per my original plan. I had changed it to the new idea on the fly because I forgot why I had planned to do it the other way (it was to have the drains enter the main after the main vent). New idea seemed more efficient (shorter pipe run, fewer turns to get to main). enter image description here

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