my bathroom sink burps
So, I have this issue - the bathroom sink and shower both drain into the same grey tank. When the tank valve is closed, I take a shower and the sink will burp up water... It's like a vent is blocked?...
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the admittance valve under the sink would be a cheep option to try it and wouldn't hurt to change if the trailer is older anyways, they are famous for failing. they are for letting air in and disrupting a vaccume that forms when water is rushing buy one pipe and no air is following, but you said it is when you are having a shower, so air should be following the water down. if you have hookups try leave your grey water dump open while you have a shower and see if it does the same thing, if it goes away then yes look at the actual tank vent to make sure nothing has built a nest in it. I usaly run a garden hose down it while its running if I suspect it is plugged, so far I have never found a plugged one...
I did buy a new one today and will take it with me tomorrow night when I go back to the RV. The water seams to drain fine when the vale is open. I will take the hose up with me to the roof as well.
