Function: 1. This valve adapter is simple to operate, easy to carry and install; 2. Made of hard plastic and high strength alloy, have strong structure, save labor, firmly seal and leak tight 3. Suitable for most paddle boards, kayaks, rubber boats, assault boats, swimming rings, floating rowing boats, inflatable beds, rowing boats, etc. 4. Surfboard accessories, can be used with air pumps, normal bicycle pumps 5. The air pump converter has stable structure, excellent performance and long service life Specification: Item Type: SUP Valve Adapter Material: Nylon aluminum alloy Color: Black Red Product Category: Surfboard Accessories Applicable People: Adults Round Connector Size: Approx. 1.4 inch / 3.6 cm, Nozzle Inner Diameter: Approx. 1.2cm / 0.5inch (manual measurement, 1-2cm error allowable) Screw connection size: Approx. 4.6cm/1.8in, Nozzle Inner Diameter: Approx. 1.7cm / 0.7inch (manual measurement, 1-2cm error allowable) Tip Connector Size: Approx. 6.3cm/2.5in, Nozzle Inner Diameter: Approx. 0.7 cm / 0.3 inch (manual measurement, 1-2 cm error allowable) Product Size: Approx. 10cm / 3.9in (size of square connector installed on valve adapter) (manual measurement, 1-2cm error allowable) Gas nozzle function introduction: The screw connector is suitable for assault boats, kayaks, etc. The sharpened joint is suitable for ring swimming, floating row, etc. The round connector is suitable for inflatable beds and inflatable pools. The square connector is suitable for SUP boards, etc. Suitable for use: paddle board, kayak, rubber boat, assault boat, inflatable pool, floating row, inflatable bed, etc. Assembly Required: Use with air pump and conventional bicycle pump. Package List: 1 x valve adapter 3 x gas nozzle