They were made out of aluminum because aluminum was on hand, I guess. Maybe it was free. Stang_Man then sells them cheap. We all win.
"Corrosion _will_ result" - well really vague tarnishing is about all the "corrosion" we're likely to see on sealed anodised. Of all places corrosion could occur, I'll take visibly through clear tubing on an easily washable part. We should hope the anode corrodes, because any galvanic corrosion on the anode plug is proof of corrosion protection in less accessible copper components. Why "protect" this component from performing a useful service?
My hot water tank has an anode plug, too. It's marked so. Perhaps I should take it out and send it to a plating service?
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