Protect your investment with this fast and easy-to-install Boat Vent II. The Boat Vent II can be added to any custom or styled-to-fit boat cover. Made with UV inhibited polymers to withstand the elements. Prolongs the life of the boat’s upholstery by venting the enclosed space of the warm, moist air. Boat Vent II helps prevents mold, mildew, and bacteria from growing under the boat cover and causing irreversible damage to the boat’s interior. Can be used alone or with most standard ¾” support poles.