Boat Vent II is molded from the strongest and best UV inhibited plastic in the world. This patented venting system is designed for boats that contain carpet, upholstery, or wood components. Venting will help prevent and stop mildew, fungus, & harmful bacteria from festering within your boats carpet and upholstery. Our vent works by releasing moisture and heat without letting any moisture back in. It is nearly impossible to go boating and prevent the interior of the boat from getting damp or wet. Exhausting moist air and heat build up will prevent common discoloration of upholstery, and it will help the overall interior to look and smell new for years to come. Boat Vent II has the ability to add many years of life to even the most expensive mooring covers. Canvas manufactures often put vital waterproofing agents on the underside of their canvas. If heat and moisture build up it will damage the covers ability to remain waterproof. The installation time of this vent is extremely fast. Some customers report a twelve second installation time. Any place a support pole goes, a vent should go. It is the first and only venting system on the market that is worthy of your consideration.