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I do not know of a "waterproof" fuse block in the traditional sense. I think you would be battling corrosion despite the cover. However, I have used the Blue Sea 187 series surface mount circuit breaker for exterior application (under my gunnels). Advertised as waterproof. Unfortunately, I believe 25 amp is the smallest. I would guess with your application for a single fuse, the inline heavy jacketed springed style splice into your wire might be the way to go. If you plan on additional circuitry, the Blue Sea circuit breaker would be a nice starting point.

Garris