[Quality Material] This kayak air valve is made of high-quality, environmentally friendly material, providing waterproof and wear-resistant performance. [Double Seal] The boat air valve features a core and cover with sealing rubber rings for double sealing, effectively preventing air leakage. Please verify the size compatibility of your kayak valve before purchasing. [Two Inflation Methods] This boat valve offers two inflation methods: Method 1: Inflate when the spring in the middle of the valve is not extended (one-way airflow). After inflation, remove the pump tube—the valve automatically closes to prevent air loss. Note: Inflation is slower and may produce slight noise due to gas pressure. Method 2: Rotate the operating lever in the center of the valve to fully open it (two-way airflow). This allows faster inflation with no noise. However, after inflation, manually close the valve by rotating the lever to prevent air loss when removing the pump. For both methods, ensure the air nozzle cap and valve are securely tightened after inflation to prevent leakage. [Application] This air valve replacement consists of three parts: inner part, outer part, and valve cap. Upper outer diameter measures approximately 6.5 cm (2.5 inches), lower outer diameter measures approximately 4.2 cm (1.6 inches). Compatible with most inflatable boats, river rafts, and kayaks. Features: Three-part design (inner, outer, cap). Suitable for most inflatable watercraft. Easy inflation and deflation. Double seal for leak protection. Reliable air retention performance. Ideal accessory for boating enthusiasts. Specifications: Upper Outer Diameter: 6.5 cm / 2.5 inches Lower Outer Diameter: 4.2 cm / 1.6 inches Height: 5 cm Color: Gray Material: Plastic Package Contents: 2 x Air Valve Units (each includes inner part, outer part, and cap) Note: Light reflection and display settings may cause slight color variation between the image and actual item. Measurement error allowed within +/- 1–3 cm.