Lezyne Classic Dirt Floor Drive Pump Long travel piston with increased barrel diameter creates 2x the airflow to quickly fill tires while decreasing the exertion required to reach optimal tire pressure Oversized piston, barrel, hose and connectors allow the pump to quickly seat the tire bead on tubeless tire systems, eliminating the need for an air compressor ABS Flip-Thread chuck threads securely to Presta and Schrader valves for a super-tight seal When you're done inflating, thread the chuck into the pump base to keep the 43&quot; rubber hose in position Oversized 2.5&quot; diameter gauge displays a maximum inflation of 70 PSI