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UNIVERSAL SUP VALVE COMPATIBILITY – Designed to fit most Halkey-Roberts (H3) style high-pressure SUP inflation valves found on popular inflatable paddle boards, inflatable kayaks, and dinghies; adapts your board's valve for use with standard air pumps and compressors. WORKS WITH ELECTRIC & BIKE PUMPS – Standard Schrader male tip connects directly to car tire inflators, portable electric air compressors, shop compressors, and bicycle floor pumps—no dedicated SUP pump required for inflation or pressure top-off. SECURE AIR-TIGHT SEAL WITH O-RING – Precision-machined alloy tip paired with an integrated rubber O-ring creates a strong, leak-resistant seal against the SUP valve, minimizing air loss during hookup and helping you achieve target PSI more efficiently. DURABLE & COMPACT 4-PACK SET – Made from impact-resistant ABS plastic and corrosion-resistant metal for long-term durability; includes two identical adapters—one for active use and one kept as a spare in your paddle board bag or car. SIMPLE TOOL-FREE OPERATION – Insert into the closed SUP valve, twist to lock, attach pump hose and inflate; easily removed after reaching pressure with no special tools needed, ideal for beach trips, lake days, and travel with inflatables.