MULTI-FUNCTION TOOL: Use to remove valve cores, install valve cores, and inflate your tires with air. 1/4" threaded inlet SAVE TIME: Cut the valve cap installation process in half. Customized with air-holding seals to speed airflow through the tire valve NO MORE: Unnecessary wear on standard valve core tools, escaped air from the tire/valve, or having to reinstall the tire chuck TO INFLATE TIRE PRESSURE: Install air chuck onto #433, push knurled end inward, unscrew valve core. Pull knurled knob back, allowing core to be safely held inside of tool's air-tight chamber, out of the path of air. FULL LENGTH: 5 1/8". (6 3/4" if extended)