If you will read my post under "Fresh water systems," we may have the same question. Your photo looks like the underside of my fresh water tank, except that there is a valve in the center of the square plate where you evidently have a drain plug. When I opened the valve, no water came out, but there was a hissing of air. I have a drain plug in the wheel well that does drain when I open it. I wonder what the square metal plate is for. Is it an access to get inside the fresh water tank?
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