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Old 06-22-2017, 06:47 PM   #1
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Black tank flush

Went to flush the black tank today and water started to leak down the pex under the vanity. (In the storage area below.) Didn't have time to check it out today but does anyone have any idea why water would be leaking out under the vanity?
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Old 06-22-2017, 06:50 PM   #2
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Check you outdoor shower connections

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Old 06-22-2017, 06:58 PM   #3
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Anti backflow valve?


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Old 06-22-2017, 07:05 PM   #4
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It comes out on the opposite side of the outdoor shower and opposite the flushers water intake.
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Old 06-22-2017, 07:23 PM   #5
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Isn't there a check valve and a vacuum breaker in the system that has been known to cause a problem similar to that?
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Old 06-22-2017, 08:25 PM   #6
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Quote:
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Isn't there a check valve and a vacuum breaker in the system that has been known to cause a problem similar to that?
Yes , it is usually under the vanity just under the sink . Has to be higher than outside connection for hose. Probably to much water pressure .
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Old 06-22-2017, 08:37 PM   #7
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Yes , it is usually under the vanity just under the sink . Has to be higher than outside connection for hose. Probably to much water pressure .
If that is the problem it is easy to bypass. After replacing the valve twice and cleaning up the water mess a few times I removed it. If you must have it I would put hose fittings on it and install it on the outside at the flush connection.
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Old 06-22-2017, 09:10 PM   #8
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Harley, I have a brand new water pressure regulator set for 55lbs. I'll look under the vanity tomorrow.
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Old 06-23-2017, 07:47 AM   #9
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I tried mine with regulator and leaked a bit ,then tried without reg. and faucet on 1/2 turn at house and did not leak.
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Old 07-04-2017, 10:14 AM   #10
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Just had this happen to me yesterday as I was flushing black tank. Made a mess in the bathroom. Guess I will remove the vacuumbreak device. Not cleaning up the mess again.
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Old 07-04-2017, 10:32 AM   #11
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Mark, what did you ever find out on this?
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Old 07-04-2017, 11:31 AM   #12
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Haven't got to it yet, will try to see what's up next weekend.
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