HIGH-QUALITY MATERIAL: Made from high-strength hard plastic and alloy, featuring a solid structure, labor-saving design, high-pressure resistance, and strong seal leak protection. Note: The air valve adapter is only suitable for hose fittings. EASY CONVERSION & INFLATION SAVING: Use a manual SUP pump to inflate the board to approximately 3 or 4 PSI, then connect to a portable air compressor until reaching 14 PSI. This method provides an efficient and cost-effective inflation process without requiring a dedicated paddleboard air pump. MULTI-PURPOSE USE: This air valve adapter includes 4 different connectors. It eliminates the need for a special rubber boat pump. The SUP pump adapter features a standard Schrader valve fitting compatible with most air compressors or bike/tire pumps. Note: The package contains 4 nozzles nested together to save space; please check carefully upon receipt. WIDE RANGE OF APPLICATIONS: Compatible with most paddleboards, canoes, rubber boats, inflatable kayaks, dinghies, inflatable beds, floating docks, pools, and other inflatable items. If the adapter does not fit your paddle board, please contact the seller. Material: PVC + Alloy Color: Red / Blue Inflatable Size: Round Head 0.62in (16mm), Sharp Head 0.23in (6mm), Square Head 0.71in (18mm), Heliciform Head 0.78in (20mm) Package List: 1 x Air Valve Adapter