Locks on-Stays On-Won't Leak Like no other air chuck on the market, the LockNFlate's six steel jaws lock onto any Schrader valve to create a secure, hands-free connection. The straight design provides a direct, in-line connection for easy use on accessible valve stems. The heavy-duty construction is built to last and stand up to everyday use in even the busiest tire shops, service bays, and garages. Features: REVOLUTIONARY DESIGN: six steel jaws lock onto any Schrader valve to create a secure, hands-free connection. STRAIGHT DESIGN: provides a direct, in-line connection for easy access on standard valve stems. 1/4"NPT THREAD SIZE: compatible with most standard air hoses HARDENED STEEL COLLET: Fits all standard Schrader valves [VG8/8V1 valve threads] RATED TO 150 PSI: Suitable for garage and industrial airline systems, auto and manual tire inflators, portable pressure gauges, and constant pressure systems HEAVY-DUTY CONSTRUCTION is built to last and stand up to everyday use in even the busiest tire shops, service bays, and garages. DURABLE, SPRING-LOADED TPU SEAL: Inflate tires with or without the valve core in place AVAILABLE IN OPEN FLOW OR CLOSED FLOW OPEN FLOW: Air passes through freely on or off the valve stem. For use with inflator gauges and automatic systems.CLOSED FLOW: Must engage the tire valve for air to flow. For use directly from a compressor or air hose. If your portable inflator uses a screw-on hose connection (like Milwaukee® M18, DeWalt®, or similar battery inflators), choose an OPEN FLOW LockNFlate Air Chuck and add our LockNFlate LNL65196 Adapter for a quick, secure connection between your inflator hose and the LockNFlate Air Chuck. If used with a multi-hose inflation system, use CLOSED FLOW LockNFlate Air Chucks. Hands-free. Leak-free. Hassle-free.