Ron3rd wrote:
Clay L wrote:
The flapper in the air admittance on the output side of the trap under the sink can stick in the open position and let gray tank odor into the bathroom.
They usually unscrew pretty easily by hand and replacements can be found in hardware stores.
X2, and had to replace an Air Admittance Valve on my old trailer (also called a "cheater vent") Picked one up at Lowes. Our smell was coming from under the kitchen sink BTW. A gray tank can stink as much as a black tank. They do make cheap ones and better ones with higher quality valves. They are a standard size and simply screw in. I think mine was around $8 at Lowes.
The same problem just happened to our TT. I put a ziplock bag over it for now to keep the odor out, but I need to get over to Lowes and get a replacement.