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Black tank flush/rinse

Yahoo Message Number: 34564
Another question for the wealth or knowledge and experience in this group: We have a 2007 Allure (31447) Hood River 430. I would appreciate an explanation of how the flush/rinse system works and the various locations of its components.
We just returned from a short trip where I attempted to rinse the black holding tank twice. The first time was as we were packing to leave a site that provided a sewer connection, we had used the black tank and just intended to drain it and then to flush/rinse. When the fresh water supply was connected to the black rinse connection and the fresh water turned on, we quickly noticed water running out of the exterior near the belt line on the passenger side near where the shower would be located inside. Upon checking the interior clear water was noted on the tile floor near the shower and rear of kitchen area.
This made me a little more cautious at the next site where the experience was duplicated.
Am I doing something incorrectly or have we possibly blown a hose connection. If so, how are the applicable hoses located or exposed? Where are they accessed?

Re: Black tank flush/rinse

Reply #1 –
Yahoo Message Number: 34565
In the water line between the fitting where you attach the flushing hose and the fitting that enters the black tank, there is a back-flow preventer valve. It should be apparent in your schematic drawings. It sounds to me that this back-flow preventer valve has failed. This happened to me with the same results. Fortunately, I was at the factory getting other service done when it happened. The location of the valve is different in each floorplan. Ours is behind the shower in a compartment that is accessed by unscrewing six screws. The valve is about 5' off the floor level.

Brian Davis

'05 Intrigue 42' Ovation Triple Slide
Coach #11901

Re: Black tank flush/rinse

Reply #2 –
Yahoo Message Number: 34570
Brian,

Thanks for the tip and advice. You scored 100%. I popped the screw covers and removed the wood screws that retain the panel in the hallway adjacent to the shower. You were right, there are two anti-siphon devices located between the shower and wall, one each for the gray and one for the black waste.
The black waste antisiphon device, clear plastic, had apparently been overtightened when installed with the outflow fitting broken. I cleaned and epoxied it, probably presently stronger than new. None could be located locally. I would expect this should be covered by warranty but it is easier to repair myself than call CC although I might ask them to provide a replacement valve that can be inventoried until another failure.
Again, thanks for your help. This and the experiences of others make the whole Internet invaluable.
Gerry Brown

2007 Allure 430 Hood River