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Old 07-14-2012, 07:11 PM   #1
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What are these?

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Can anyone tell me what this is? It's under my bathroom sink in my TT. The black "knob" spins at the top when I turn it but doesn't screw off. Also any idea why one of the hoses is orange? I opened up a panel underneath this(the hoses go through a hole into a lower covered area below this area underneath the bathroom sink) and connect to all the other water hoses but they are all white in color. Also the water pump is in that area. I'm trying to investigate how water was coming into this area when I used the outside black tank flush from our first camping trip with this new trailer. Thanks y'all...

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Old 07-14-2012, 07:18 PM   #2
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It looks like a air admittance valve. They are designed to let air into the hoses but not let the water out. There is a flapper of sorts inside to act as a check valve. If water is comming out than you need a new one.


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Old 07-14-2012, 07:18 PM   #3
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That is probably the anti siphon valve for the black tank flush line. They are typically put under bathroom sinks. When they fail (or are put in backwards) they will leak water.
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Old 07-14-2012, 07:20 PM   #4
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I do think that's where I had water coming out when I attached to the black flush tank when getting ready to leave the CG. Can I usually find one of these at the RV store?
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