We have a 2008 305RLT Mountaineer and have had a problem with the anti-siphon valve under the bathroom vanity leaking. We've had it replaced 3 times, the first two were black plastic and the third is metal. I didn't know the exterior hose was supposed to be disconnected after flushing the black tank so have been leaving it connected all the time. Could this possibly be the reason there is water coming out of the valve under the vanity? It does this sporadically.
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