Just bought this house and want to add a disposer under the double kitchen sink. The "flipper" we're buying from moved the sink from across the kitchen and the new one isn't tied into the vent stack. Our home inspector said the nearest vent is seven or eight feet away...inaccessible and too far from the fixture to satisfy code anyway. He suggested we have a air admittance valve put in when we have the disposer installed. The under-the-sink drain plumbing doesn't seem to be well done and needs a makeover when a disposer's installed. I think that's an S trap they created in there.

Dishwasher's to the left of the picture and the countertop is granite (tougher to cut in an above-counter AAV?) We'd like the disposer under the left side sink.

I'm not sure I'll attempt this, but whether we have it done by a licensed plumber or I do it, any suggestions on how, done right, it should look? I can post another picture if the "big picture" and "under the hood" views don't show things adequately.

Thanks for any advice.

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