Quote:
Originally Posted by Rainsmik
Sorry for the delay in getting back to you. Posted and went to bed. The cabinet that I am referring to is not the one with the sink. It is located next to the hallway but within the bathroom. The sink is on the opposite (exterior) wall. Could the back-flow valve still be the problem? And, if not, any ideas?
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I also have an 2018 3811MS and I am flushing my black tank as I type this (on a water timer) I can hear the noise the backflow preventer makes coming from the towel/linen closet. Here are some pics. The hatch is in the bottom cubby hallway side.