ITEM NAME:1 pc Plastic Board Surfboard Auto Air Vent Screw-In Exhaust Valve High Quality Descriptio n Description: Plastic Board Surfboard Auto Air Vent Screw-In Exhaust Valve Plug Gear. High quality plastic material with waterproof and dust-proof function. UV resistant, sturdy, lightweight and durable. Easy to install, remove and use. Great for stand up paddle board, surfboard, watercraft and so on. Specifications: Material: Plastic Bottom Outer Diameter: 18mm/0.71inch Outer Diameter: 25mm/0.98inch Height: 18mm/0.71inch Package Included: 1 Piece Surfboard Auto-Vent Plug Note: Note: Color might be slightly different due to the color calibration of each individual monitor. Please allow slightly measuring deviation due to manual measurement. 1 pc Plastic Board Surfboard Auto Air Vent Screw-In Exhaust Valve High Quality.Great for stand up paddle board, surfboard, watercraft and so on. High quality plastic material with waterproof and dust-proof function. We'd like to settle any problem in a friendly manner. Specifications:Material: Plastic.