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Old 04-10-2015, 03:12 PM   #41
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Brand: Thor Motor Coach
Model: 2011 Four Winds 28Z
State: Michigan
Posts: 1,273
THOR #531
Well I learned something today. I went out and checked my coach, and sure enough, I have a cheater vent behind both sinks, similar to the schematic that BLW2 showed.

I am rather surprised though, as the drains are pretty much a straight shot to the tanks. Me thinks its perhaps another example of guesswork engineering.
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Old 04-10-2015, 03:24 PM   #42
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Model: 2013 31L
State: Florida
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THOR #908
I'll bet you're right on that !...
I call it
"Star Trek Engineering.... Going where no man has gone before"

I'm not a plumber, but I've worked with piping and pumping systems for a good bit of my career. My "gut" tells me that my lav sink drain is a short enough run to the tank, along with a small enough flow rate, that I'd likely be ok without the air admittance device. Although there may be issues if say, dumping a pot full of water in the sink, especially given the horizontal run...... So, not great but maybe ok....
...but my kitchen sink is such a long run to the tank that it would likely be problematic without it.

If my problem continues, I think I'll remove the lav valve and plug it to see what happens. If I think about it, maybe I'll throw a 1-1/2in NPT plug into my RV project box so that I'll have one handy on my next trip....
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Old 04-10-2015, 03:43 PM   #43
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Brand: Thor Motor Coach
Model: Axis 24.1
State: Michigan
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THOR #1150
Our Axis also has these valves on both sinks and, in my case, both tanks vent through the same roof vent--I posted that diagram earlier. Our kitchen sink has a long run to the drain and the way they plumbed the bathroom sink turned that into a long run as well.

As mentioned: just another maintainance item to keep an eye on.
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