Apr 16, 2018 · AAV's are prohibited in the Uniform Plumbing Code, It is not that the UPC specifically prohibits AAV's. It is a default position that AAV's are not an approved product …

Nov 13, 2020 · FWIW, It seems as if the AAV are very effective at sealing under pressure, which is what the tests I just made using the tips above seemed to indicate, but the function I really …

Apr 5, 2012 · The AAV is a one way valve letting air in to prevent siphonage, which BOTH traps need and your AAV will provide. The positive pressure situation occurs if the discharge is …

Jan 4, 2025 · The AAV is equipped with a float located internally, which is utilized to open/close a bleeder valve. The float will not 'float' when the chamber contains air, so the bleeder valve will …

May 22, 2025 · Hi, My sink has been plumbed with an S Trap since I remodeled In 2010, I get gurgling when dishwasher runs and sometimes sink drains slow ( speeds up if I manually open …

Jun 25, 2010 · Hey All, My local inspector allowed me to use AAVs on my kitchen double sink, as there was no good way to hard vent it. He said that a double wye with an AAV off the top was …

Sep 8, 2022 · Additional question. The AAV has a 20 DFU stamped on it. However, at Menards, Will this replacement unit from Menards WORK (says 20 DFU Branch/8 DFU Stack? I have no …

Mar 18, 2024 · DIY plumbing a basement bathroom in Michigan (IPC) and am wondering about venting. Only real access to existing stack is a 3" line that carries waste from other bathrooms …

Jan 24, 2025 · Yes for the IPC, although that requires you to get the exact slope of 1/4" per foot. Slope it more, you reduce the maximum horizontal. No for the UPC, as it further imposes a …

Nov 20, 2022 · The bathroom downsteam will be vented temporarily with an aav, and then when renovations are continued next year on the upstairs bathroom, venting will be tied into the …