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Old 05-24-2020, 11:43 PM   #1
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Slow draining bathroom sink

what would cause the bathroom sink to drain really slow and the shower drain? Also , under theckitchen sink theirs water but no hint of water leakage from the pipes. Im stumped. I am hooked up to a permanent site.
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Old 05-25-2020, 10:00 AM   #2
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Possibly the gray tank valve is closed and the tank is filling up. The drain traps could also be plugged. In the kitchen sink I have had the trap fittings loosen and leak.
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Old 05-25-2020, 11:10 AM   #3
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i just checked my tanks for being full and my black says its 3/4 full butvtheirs nothing coming out. Why is that?
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Old 05-25-2020, 11:37 AM   #4
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You do realize that the black should always be kept closed and only drained when close to full.
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Old 05-25-2020, 06:29 PM   #5
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Also, Tank sensors are notorious for being off. They get cluttered with debris, and rarely read correctly. Turn your water off. Hold down on your toilet flush pedal, and shine a flashlight down there. If you see the bottom of the tank, shes empty. If you see liquid, and its not draining when you pull the valve lever, I would take a hard look at your knife valve. Make sure its opening and closing properly.
As stated above, your tank valves should be closed until tanks are near full, and then opened to empty. Leaving it opened while hooked up just allows solids to accumulate in the tank.... If your gray tank is full, water will start coming up the floor drain in the shower before anything else.
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Old 06-01-2020, 07:31 AM   #6
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There should be an in-line flexible back flow check valve on the shower drain. This device keeps the gray water from back flowing into the shower when the gray tank over fills. Because it is flexible it is possible that it may have bunched up when doing its job. It is simple to straighten out after removing the valve from the unit.
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Old 06-01-2020, 02:14 PM   #7
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Here is what my valve looks like.
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File Type: jpg RV Back flow valve.jpg (238.4 KB, 7 views)
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Old 06-01-2020, 02:21 PM   #8
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It's a HepVo waterless trap. https://hepvo.com/applications/rvs-campers/
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