Dave,
Those two side by side petcocks are the water system low point drains. One for cold one for hot. Used in the winterization or water system draining.
The fresh water tank might be a white plastic drain all by itself. Or the drain valve might be some other type. To locate the drain look for the fresh water filler door, that's feeding into the tank. The drain will be under that area somewhere I bet.
Gary
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S/OS #001 2005 Dodge Ram 2500 5.9L 6 Speed
16" Michelins, Hi Spec Wheels, Max Brake, Dexter 4 Piston Disc Brakes, Carslile Actuator, Equal-I-Zer, Dill TPMS. Campfire cook. BMV-712. DEMCO 21K Lb Cast Iron coupler
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