Westward Ball Foot Air Chuck 2HKY1 Heavy-duty tire chucks are ideal for inflating, deflating, and measuring air pressure for large equipment such as trucks, trailers, and tractors. They can handle air pressures of 100 psi or more. Application / Checking Tire Pressure Chuck Type / Ball Foot Push-On Color / Silver Finish / Zinc Plated Head Style / Single Material / Brass Maximum Operating Air Pressure / 150 psi Maximum Operating Temperature / 122 °F Maximum Safe Storage Temperature / 122 °F Minimum Operating Air Pressure / 0 psi Minimum Operating Temperature / -4 °F Minimum Safe Storage Temperature / -4 °F Number of Tire Inflators / 1 Product Type / Heavy-Duty Tire Chucks Thread Size / 1/4 inch Thread Standard / FNPT