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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** UPDATE **
Well, not really. Didn't go on the roof, ran out of time. The valve I purchased for under the sink did not fit .... BUT, I ran a couple tests, filled sink up several times with the valve open, and several times with the valve closed.. The sink drained like a whirlpool each time.. What I did notice was if I kept the sink drain stopper closed, all would be OK until the tank reached the 3/4 or more level, thats when it would blow a burp of water up the sink.
