I install electrc water heater 14 months ago. Came out of water heater with 3/4" galv. nipple 3" long into female copper adapter, and then 2 feet copper into stop. Same type piping on hot water side. The problem is the cold water nipple looks rusty. No water showing at fittings, but it looks as if it had leaked at some point. I removed the fittings and the nipple looked to have small chunks of metal missing. at the start of the treads. the hot water side outside looks normal. Any ideas?
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rusting water heater fitting