Quote:
Originally Posted by droregon
So, if all the black tank flush plumbing have back flow valves built in, why the great concern about using a dedicated hose?
I can understand not using your white fresh water hose, out of abundance of caution. But any other hose would do?
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Because the backflow preventer for the flush is exactly the same as the backflow preventer for your city water inlet: it's a simple rubber disc check valve which can and do fail. And unlike a vacuum breaker backflush preventer, when it fails you have no idea unless there's pressure in the tank and you hear it escape when you disconnect the flush hose.
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