I had the same issue on my Octane. Running the pump would fix it for a while, then the fresh tanks would overflow again. I replaced the pump (thought it was the same one that was in it), but that pump does not work as good as the old one. Surges, and you get hot, then cold water. Not sure you can get just the check valve. Fortunately, all you're doing is watering the grass around you RV site...:-)
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