Pressure Relief
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What would cause water to leak out of the pipe where the Pressure relief valve is on a hot water tank?
It was purchased new in 1999.
Most likely the valve is worn out or debris has gotten into the seat to keep it from closing. First, try flushing the valve thoroughly by pulling the handle all the way up several times, if it still drips, replace it, but be absolutely sure that the new valve matches the old valves rating exactly[on the handle tag]. Most importantly, be sure that the water is not overheating and the valve is just doing it's job, but I think you would have noticed that. Also be certain that the pipe leading from the pressure valve is the same size as the thread on the valve.
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