A/C drawing air up sink drain.
Whenever we turn on the A/C, it's just a matter of time before the whole RV STINKS. It appears the A/C is pulling air up the waste pipes connected to the double sink. Under one sink there is a drai...
Forum Discussion
Old-Biscuit wrote:
A/C Unit can NOT pull any vapors thru water in 'P' traps....not going to happen
A/C Unit return air CAN pull odors from grey waste tank via the Air Admittance Valves under sinks on drain line downstream of 'P' trap.
OEM AAVs are just a thin flexible diaphragm held in-place by a 'tang' on diaphragm
Tang stretches...diaphragm doesn't seal off..stink from grey tank comes into RV.
Cheap ones available for $5 at Big Box Stores.....better ones/higher pricing also available.....
I replaced mine with these as suggested by forum members. The manufacturers web site is quite extensive explaining design and function.
