Air Admittance Valve Question ......

Double-A

I can roll with that, but when he said the shower drains well with the clean out plug open, I knew it was because the shower was pushing air ahead of it (99.90% sure), and that you can move that AAV around all day long and it still will not work. I had him test to convince himself this was the case, otherwise, he has a grossly undersized (highly unlikely, as the smallest you can get is 1-1/2") or defective AAV (more likely).

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"My clients’ wishes are the center of my attention." -- David Guido, a contractor in Woodstock, N.Y.
New York Times, July 20, 2006