ITEM NAME:Premium Surfboard Vent Plastic Surfing Air Vent Breathable Stand Up Paddle Vent 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. Specification: Material: Plastic Bottom Outer Diameter: 18mm/0.71inch Top Outer Diameter: 25mm/0.98inch Height: 18mm/0.71inch Package Includes: 1 Piece Surfboard Auto-Vent Plug Note: Color might be slightly different due to the color calibration of each individual monitor. Please allow slightly measuring deviation due to manual measurement. SKU: DMO0018321254040387.Great for stand up paddle board, surfboard, watercraft and so on. Plastic Board Surfboard Auto Air Vent Screw-In Exhaust Valve Plug Gear. 1 Piece Surfboard Auto-Vent Plug. Easy to install, remove and use.