Features 316 stainless steel cowl vent, interior marine grade corrosion resistant white epoxy paint, round opening to allow maximum air to enter the storage box Durable and Long-lasting: High-quality 316 stainless steel with water and corrosion resistance, can adapt to harsh weather conditions Easy to Install: It can be used for boats, kayaks, yacht doors, marines, easy to install and remove without modification Circulation of Air: Damp air permeates the cabin, damaging the vessel, gear and locker contents. Good ventilation removes moisture from the inside of the boat, helps keep the bilge odor-free and prevents corrosion of steel and aluminum components Diameter: 3 inches Package List:1PCS