It is a fresh tank. There are 2 fresh tanks side by side with a gate valve in between, so I can isolate 1 tank from the other. The valve you see in the picture is to empty both fresh tanks. Also, the fresh water line (blue pex) comes out of the bottom of the tank that is leaking, and that line is just outside the top picture. My gray and black tanks are closer to the front of the trailer. The gate valve in this picture is on the passenger side right by the front door. My waste valves are on the drivers side.
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