I have a 2016 Fourwinds 31W. The built in flush out system has never worked since Purchased. Dealer said he could schedule me in end of May. When I connect the hose to the flush out it stays under pressure with the dump valves open. Traced out the plumbing which goes across and goes up through the floor seems to be behind the sink cabinet. It seems as if there could be a valve closed but could not confirm what's behind the cabinet. Before I pull out the cabinet, Does anyone know if they would put a valve in the flush out line.
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