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I had that valve freeze once when I did not push the pin in. The ice pushed the o-ring that's inside the valve out of place, keeping the valve from stopping the flow. When I'd fill the fresh water tank it would gush out of that valve. Any time we used the pump it would gush out of that valve. I suspect when you applied the pressure to the pin, the pressure from the other side dislodged the o-ring. A very small screwdriver and a flashlight and some patience and you can get the o-ring back in place. Or just replace the valve. Any rv dealer should have it although you may have to replace the whole housing. I'd try getting the o-ring back in place first.
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