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2 Pack - EPAuto Open Flow Straight Lock-On Air Chuck with Clip for Tire Inflator• Open Air Flow. Air flows freely through the chuck even though the tire valve is not engaged. • Works without a valve core.1/4" NPT (National pipe thread): • Pipe Outside Diameter (OD): 0.54" • Approx. Thread Length: 5/8" • Approx. Thread Length, Hand & Wrench: 3/8" • Thread Pitch: 0.05555555...$9.87$9.87