Oatey, 1.5-2", White 39016 Air Admittance Valve with Straight PVC Schedule 40 Adapter Sure-Vent 1.5 in x 2 in. 160 Branch, 24 Stack DFU Capacity

Cons: a bit expensive for a few ounces of PVC and a diaphragm. But you're not simply paying for the material, testing had to be done on these to make sure they work for a long time keeping sewer gas out of your home. Also, I really wish they would make these in 1.5" as all my non-toilet p-traps and drains are 1.5", in the 3 areas I'm utilizing air admittance valves, space is precious and I had to waste a few inches on a 2" to 1.5" reducer. Note: you do want the valve to be 4" higher than horizontal trap run, so it's not like you'd be able to 90 up and go straight to the valve anyway. Pros: quick and easy to install.... easy as any other pvc connection. I'd suggest looking into local plumbing codes to verify if air admittance valves in general, or this product in particular, are approved substitutes for venting. My local codes specifically list this product as approved with a few clauses. I have an existing 3" cast "main" vent, which qualifies this product for use where adding a vent would require opening up a lot of wall space, and a few other details. This was the perfect solution to the b.s. horizontal vent termination out the side of my house done by previous homeowners in the kitchen and complete lack of venting for my bathroom sink and tub. .... word to the wise and those not already high on pvc cement: do NOT test the valve by using your lungs after you've cemented any fittings or pipe, but before connecting to existing system. If you're so inclined to do so, be certain fumes have dissipated. *ahem* not that I would be so foolish to do so, but even after 15 minutes of dry time, there might be enough solvents in the air to cause considerable discomfort and likely damage to the lungs. Worked though, admitted incoming air, but stopped outgoing.

Worked great. Just what I needed. Drains better than ever.

Solid product that works well.

Magnífica la calidad y el servicio que ofrece el producto inovador

Awesome product and unlike some others on sale at Amazon, you get everything you need to install them under sinks, including the AAV. We ended up in a new area where we didn't know many people and hired a bad general contractor to build our dream home. He ignored the advice of a good plumber that told him there needed to be a lot more wet vents going through the roof, and hired a plumber who would do what he wanted and only put three wet vents in our house. Some fixture vent pipe had to travel 15 feet to get to a vertical wet vent pipe, where they recommend they travel no more than 5 feet. When our clothes washer or dishwasher expelled their water, it would suck the water out of the both the shower and the bathtub drain and then we would get major sewer smelling coming up through them. We had to duck tape them closed every time we used one of the washers. What no plumber or internet page, I could find, would tell me, was adding these vents to into the same vent system, but not on the fixture who's p-trap was being syphoned or the fixture causing the syphoned (washers) would help keep stop the syphoning. The only easy place to install these was under the sinks and it worked! No more syphoning and sewer smell! Saved $1,000 of dollars not having to pay a plumber and carpenter to install more wet vents.