As with everything, pricing is relative. The price for the Zinc itself with ~$25 seems reasonable, BUT they don't hold up at all.
They are nicely streamlined shaped as a cone, 3 holes for the plastic bolts and all but they are hollow. I have a diver cleaning the bottom/checking the zincs every 4 weeks in the summer and every 6 weeks in the winter. The Autoprop zincs is only good for about 2 month while all other zincs are holding up 6 to 9 months or more.
I guess if they would be more solid there would be more sacrificial material and they would hold up much longer. Compared in regard to the lifespan with other zincs for me the Autoprop zinc is at least 3x more expensive. I heard about bronze adapters available one screws to the back of the prop to be used with shaft zincs.
If anybody has experience with this and has a link for a source it would be greatly appreciated.
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Island Packet 37 (hull53)