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The "cheater vent" is really called an Air Admittance Valve.
Used commonly in RV's, mobile homes, and even sticks and bricks in locations such as kitchen island sinks.... where it's not possible to vent the fixture.
Good timing on reactivating this thread. I had a similar bad smell problem at the end of my trip last weekend. My initial trouble shooting led me to believe that maybe the vent stack plumbing was loose or disconnected.
I filled my tank up to just inside the sink (over the level of the toilet) and no leaks were found.... then I discovered that my lav air admittance valve was less than hand tight.... so I'm suspecting that was my problem.... er at least that's my hope.
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