This looks like a pressure relief valve on the cold water line to my water heater. It is leaking outside. I've never seen a relief valve on a cold water line. Why
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plumbing - Why does shutting off cold water valve to the water heater shut down cold water in entire house? - Home Improvement Stack Exchange
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plumbing - Why does shutting off cold water valve to the water heater shut down cold water in entire house? - Home Improvement Stack Exchange
