We have replaced ours with Valterra valves. As mentioned, you need to drop the under belly (coroplast) under the basement. They are blade valves that are activated by pulling the cable handle ( as you already know), which is connected to the blade valve at the tank. Perhaps your valve is not properly adjusted or moving?
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Ron and Terrie Ames - MOC #1920/KF0NTA
2021Montana 3230CK Super Solar Legacy Package
2021 Ram 3500 Laramie Longhorn, BIM Charging
4x4, SRW, LB, Crew Cab, Pullrite 3900 Hitch
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