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Old 05-03-2015, 09:06 PM   #11
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It's weird,I would think that the black tank flush is its own seperate line to flush the tank.I could see check valve on that line so nothing could come back to hose but don't see how it could get to city water
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Old 05-05-2015, 09:41 PM   #12
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You have to connect the hose from the black tank flush connection to the city water hosebib otherwise you wouldn't get any water to flush the tank. The check valve is on this pipework so that water will not have the possibility of being drawn back through the hose from the black tank if for some reason the city water main got shut down while you were connected to it and you had left the hose on and connected.
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Old 05-05-2015, 09:51 PM   #13
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Man I feel like a dummy.I read into to much and was thinking the water in the trailer itself,not realizing it could back up into the supply from campground....
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Old 05-12-2015, 05:39 PM   #14
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It could possibly happen, but the black tank is not pressured and the inlet hose inclines from underneath the unit to part ways up the side. The valve mfg states that the valve will vent water at any time. There are rubber flappers inside, and they will stick, causing the water to run out the top. They have a redesigned valve, that mounts on out side of unit, and sent me one no charge when mine sealed shut. and flooded my t/t. Had a long battle with Jayco and valve mfg. last year over this problem.
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