I had the same issue. Instead of trying to connect both tanks I used 3 inch pvc to hook up the bathroom. Then I bought a cover for the other tank, from camco, with a water hose connection and run a extra water hose, i had, over to the sewer. Just need to drain that tank every so often. Then I lift out the 3 inch and put the water hose in and pull the plug. When I am done I just role the hose up under the camper. For me, it saves alot of brain damage.
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