I'm not overly familiar with the class A,B,C type vehicles, but is it possible that the fresh tank is "inside" the vehicle and there is a drain valve near it?
Or do you have one of those overly complicated "all in one" panels that controls all the black/grey/fresh/city water functions?
Jim M.
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2020 Flagstaff Super Lite 26RBWS
Former: 2017 Rockwood MiniLite 2104S
2015 Silverado 2500HD 6.0L Gas
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