The Acme Automotive 3-in-1 Combo Tire Deflation/Inflation Tool saves time and money when installing new tires. The Combo Tire Deflation/Inflation Tool removes the core while still having the chuck engaged to the valve stem. The Lock-On Air Chuck holds unit securely on the tire valve while the operator's hands remain free. The Full Bore Inflator/Deflator allows for rapid filling or emptying of tires while the Valve Core Tool captures the valve core and prevents the loss of the valve core during the inflating or deflating processes. The Full Bore Inflator/Deflator allows for rapid filling or emptying of the tire.