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When I first got my trailer and turned on the city water, the pressure relief valve at the rear location dumped water right on the ground under the trailer. I thought before I replaced it I'd open it up and take a look. When I opened it up, I could see the plunger over opened and caught on the edge of the seat rim. I gave it a little push and it dropped back down into it's seat. I reinstalled it and it never leaked again.
I guessed that the previous owner had used shop air pressure to winterize the trailer and the blast of 120 psi air pressure pushed the plunger up out of it's seat.
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