I had a liscensed plumber replace my gas water heater in august and everything has been fine but I just noticed today that the dielectric nipple that came with the water heater is rusting down at the base of the tank on the cold side. I dont see any water down there. The hot dielectic nipple looks fine. The water heater sits in my pantry and is vented. What's going on? I thought dielectric corrosion happened where two different metals meet? I attached a picture below. Thanks in advance!
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