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Old 07-09-2012, 12:25 PM   #1
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Leak after flushing Black Water

Maybe someone can shed some light on this for me. This has happened twice to me. I flushed my Black water tank with the dump valve open and I had water on the floor in the bathroom and running under the bathroom cabinet. I took paneling off and I cannot find a crack or loose pipe. Any ideas or thoughts on what it may be would be helpful.
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Old 07-09-2012, 12:32 PM   #2
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You will see a water line that runs up high under the counter under the sink to a fitting. That is a vacumn breaker and the line coming out goes to the sprayer mounted in the black tank. That breaker is leaking somewhere. Get someone to turn the water on tho the tank flush and then turn it off after a couple of minutes. If you watch this fitting with a flashlight during this procedure you should see your leak.
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Old 07-09-2012, 12:38 PM   #3
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I will give that a try thanks.
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Old 07-09-2012, 03:55 PM   #4
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I had a similar situation a few years ago and it was thge hose connedction fitting on the outside. I replaced the connection with a new one and solved the problem. We saw the leak by looking under the vanity as it was connected to the flush hose at the dump station.
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Old 07-09-2012, 05:56 PM   #5
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Yup, same problem here, but just a slight leak. A common brass elbow replaces the unit that connects to the pex under the sink and get a hose connection "backflow" preventer from Lowes, etc. and install it on the hose connection in your water compartment. The factory unit is small, a piece of crap (pun intended), and restricts full flow and you will get more flow to flush the tank. The one installed by the factory is there to meet ANSI standards and with the elevated rise and a backflow preventer installed on the inlet, you have the same thing. This is why the parks have backflow preventers on their supply valves.
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