Re: Cutout Cover
Depends on how much you want to spend, what sort of boat, what would look good...
1. Some sort of material, including teak or wood or metal, with 4 screws. Maybe dress it up with paint and a logo or sticker or something.
2. Inspection port (purchased) if you want to be able to reach in there for some reason (but you could just unscrew it, see above).