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That blow off valve should not leak. I use mine frequently, I even made up a fitting to blow compressed air in through that valve, to aid draining. You must have gotten some rust or dirt in the seat, and the only way to clean it, is take the pressure off and drain the water to at least below the valve.
While you're at it you could replace the plastic valve, because those bastards won't seal if they are the least bit dirty, either. Have to run clear water through them which means flushing all the crap from the bottom of the tank.
I've had pretty good luck using a garden hose with a plastic coupling, and a spongy washer. The brass couplings, not so much.
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The descent of man ~ Nixon, Friedman, Reagan, Trump.
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