The LockNFlate&';s six steel jaws lock on to any Schrader valve to create a secure, hands-free connection. The heavy-duty construction is built to last and stand up to everyday use in even the busiest tire shops, service bays, and garages. Limited stocka "order now! Features: Durable, spring-loaded TPU seal Fits all standard Schrader valves [VG8/8V1 valve threads] Rated to 150 PSI 1/4a NPT Thread Sizea "compatible with most standard air hoses Heavy-duty construction for strength and durability resists corrosion Suitable for garage and industrial airline systems, auto and manual tire inflators, portable pressure gauges, constant pressure systems CLOSED FLOW: For use with any multi tire inflation deflation system, or directly from a compressor or airline. Must engage the valve to open the seal. Works with all systems except for computerized commercial-grade systems. The smallest OD of any closed flow air chucks (.63" compared to our MORRFlate Locking Collar Chucks at .84") The shortest engagement depth of any closed flow air chucks (.09" compared to our MORRFlate Locking Collar Chucks at .14")