This may be a dumb question but I have two blue hoses coming out of the bottom of our class c. One has a cap on it and the other does not. What are these two hoses? Is one the drain and the other a valve?
If they are near the fresh water tank one is probably to drain the fresh water tank and the other an overflow, but you should have a drain for the hot and cold water lines somewhere as well.
I have 2. 1 that's capped is the low point drain. The other is the fresh water tank drain and the valve to open is behind a panel with the pump and filter. Class C.
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2012 SunSeeker 3100SS Toad-1962 Futura Average 100 + days camping