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Old 08-17-2014, 05:25 AM   #1
astrungis
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Back flow under Master Bath sink?

Can someone help me? I have a leak under the sink above. I see it is coming from what I think is a back flow. I removed the carpeted box and see a blue tube/cold, red tube/hot, and two white tubes that are connected at the top (18" tall) by a black plastic gizmo that looks like a vent. Can it be cleaned to operate properly, replaced or bypassed and the heck with the back flow? Thanks in advanced. Tony
 
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Old 08-17-2014, 06:08 AM   #2
nosticks
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It is an air admittance valve. They are often used where a roof vent can't be used. It should have a flapper inside and the ones I've seen can be taken off and cleaned.
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Old 08-17-2014, 06:30 AM   #3
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If the "black gizmo" is connected with two hoses, that is the backflow preventer for the tank flush system. These valves are notorious for leaking and many have just simply removed them; others have replaced them with brass check valves. If the "black gizmo" is part of the drain piping system it is the air admittance valve. I removed mine and plugged it due to it releasing sewer odor.
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Old 08-17-2014, 08:11 AM   #4
DQDick
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Because of the two hoses it has to be the back flow preventer. Many of us have removed it and replaced it with a better one or another way of doing it. Being from the restaurant business I've seen too many bad things happen from not having one to go without.
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Old 08-17-2014, 11:42 AM   #5
Phil P
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Hi

Our unit came from Keystone without the back flow preventer or any check valves in the black tank flush system.

We only added a check valve at the water connection in the water center when we replaced the basement floor and water center because the water that had been draining out of the water supply port and the black tank wash system behind the water center had rotted the floor.

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Old 08-19-2014, 05:22 AM   #6
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Well, I bought a couple of 90 degree "shark bite" elbows at HD and removed the back flow preventer under the bathroom sink. Now I am going to buy a in-line hose back flow preventer in the convenience center. BTW, I use the outside cold shower valve and the coiled blue hose and connect it to the black tank flush since we never use the outside shower. At this spot, I will install the in-line back flow preventer. Thanks to everyone!
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