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Try snugging up the shutoff valve on the overflow. If that doesn't stop the leak you may have to have a new washer. Be sure your overflow pipe is plumbed to the outside. I had an overflow valve blow on my water heater and it blows out steam and near boiling water. Very dangerous. Buy some pvc pipe and send it outdoors. If not corrected the dripping will get worse. (and it could be the popoff valve itself leaking)
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