I thought my explanation waas too simple - so if I am getting backflow at this level, the anti-siphon valve may be faulty? I haven't located that yet but will keep looking. In the meantime I am just going to keep the black tank open for the time being. I will provide an update soon. Thanks Carl!
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Maxwell and Beverly Dow
2018 3730FL 2020 Ram 3500 Dually SWB
"Prairie Schooner"
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