Details: Specification Packing: 1PC Material: plastic Bottom diameter: 26mm (1in) Panel diameter: 31mm (1.22in) Height: 15mm (0.59in) Colour: Black Feature Sturdy, ageing-resistant, long service life, durable, waterproof and dustproof. Protective vents for surfboards and boats, allowing vents to function by allowing air and other gases to freely pass through the membrane, but preventing liquids from entering the enclosure. Suitable for stand-up paddle boards, surfboards, boats, etc.