Air Admittance Valve for RV

If you are talking about the threads, they should be 1 1/2" MPT.

Last year my vendor had them for $2. This year, a new model, $20.

Sorry, I meant the diameter of the valve.

JohnRa wrote:
Sorry, I meant the diameter of the valve.

The overall diameter doesn't effect the functionality. Are you having a fitment issue?

The one I bought from Home Depot has a much larger diameter than the one I'm trying to replace.

Be sure to remove the 2" adapter on the new one if you are talking about the thread size/diameter. The existing plumbing should have a 1-1/2" fitting.

The valve diameter shouldn't matter.

I've seen both the large type you are talking bout and smaller ones. Try to see if they have this one (if it will display for you).

Chris, that's exactly what I needed. Appreciate your help!

The threads on the AAV in our KZ are 1 1/2". If it really is smaller, just get an adapter.

FWIW, I bought a replacement AAV for the one that failed in our KZ in less than year at Lowes. Well, that one failed too in a year.

I would suggest getting a high quality Oatey AAV or equivalent. The quality one cost quite a bit more tho.

I don't really have much room under the sink. the cheater valve actually hits the underside of the sink.

Plus we've still got the smell from the sink. Boo. I think I may have to tear the drain apart and see if we've got something in there.