CTA Tools 1930 Straight Lock-On Air Chuck features a clip that locks onto the valve while inflating the tire. It has 1/4-inch female NPT and 3/4-inch hex. Heavy-duty, brass construction allows for strength and durability. Whether tuning up your ‘68 Corvette or changing the oil on a John Deere tractor, CTA can supply you with the tools needed to do the job. California Prop 65 - Warning, This product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm