When it rains, water sometimes gathers on the cover, possibly causing it to rip later on. The pool of water could lead to the development of moisture, which contributes to mold growth. No. 6000 is a one-inch nylon belt to keep water from pooling on the cover. Hooks to bow and stern eyes to form a ridge line for the cover. For boats with center line windshield and/or seats above gunwale. Fits boats from 14 ft. to 19 ft.