Cup Holder Cover

On my boat, there are 2 covers, one over the open bow, and another over the rear cabin. There are 2 cup holders in front of the windows not covered by either, so they're always getting clogged with leaves and filling with water. This loosely fits in the cup holders and sits flush with the boat because of the concave lip.

Works for 2.5" cup holders. Remove before towing the boat anywhere or they may fly out.