I may be wrong but you may not have a valve that is typical on water distribution systems such as the Andersen Kant Leak. You may just need to fill the fresh water tank and turn on the water pump. That is how my prior class c worked.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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