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Just went to West marine ONLINE to look at fittings and I saw an article on grounding. here what it said about thru hulls. I think this apples to mine.
Zincs and Protection from Galvanic Corrosion
An isolated bronze thru-hull doesn't need protection because it is not in electrical contact with another immersed dissimilar metal. If electrically isolated, high quality marine bronze, is electrochemically stable in seawater; nothing good can come from connecting wires to it.
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