When I kept my boat in the water and had the bottom cleaned every other month, I would keep 1 or 2 of each zinc type on the transom. When the diver came to clean, he would change the bad zincs at no extra charge using the ones I provided.
As I recall, he changed the prop shaft zincs mostly, never the trim tab zincs and maybe every year or so for the transom zincs. For this single engine boat, I had one prop shaft zinc, two trim tab ones and two transom zincs for a total of five. Sixteen sounds crazy.
David
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