HEAD ONLY INSTANT INFLATION - When you need to inflate a tire quickly, the Control Drive C02 inflator is ready to perfrom. Simply attach a C02 cartridge, slip over the valve and open the over-sized pressure control knob DURABLE MATERIALS - This drive is crafted with CNC-machined aluminum with brass internals, so you can count on it in any conditions. OVERSIZED CONTROL KNOB - One simple over-sized control knob allows you to easy inflate your tires. COMPATIBILITY - This drive valve is compatible with Presta and Schrader valves.​​