Features: 2pcs air valve adapters with rubber gaskets. Replaceable and useful, with high strength and environmental protection. Fit for inflatable boat, kayak, caone, etc. Specifications: Material: Nylon Dimension: 30 * 49mm / 1.2 * 1.9in Bottom Inner Dia.: 18mm / 0.7in Upper Inner Dia.: 16mm / 0.6in Weight: 7g/pc Package List: 2 * Valve Adapter for Kayak