After installing a non-vented double stainless steel kitchen sink and having a drain problem, I started looking. I came across a video about using AAV. This seemed to be the most discussed and used, so I gave it a try. Glue and I was ready to go. Works perfectly! The sinks fit in like a charm! NO gurgles or bubbles. This device works as a sliding hardware in 1 1/2" PVC (like I used) or 2" PVC.
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