The Topeak Roadie DA-G Hand Pump with Gauge uses Dual-Action to double volume by inflating on both the push and pull strokes. The integrated dust cap of the Topeak Roadie DA-G Hand Pump keeps the pump head clean and the handy thumb lock lever ensures an air-tight seal. Topeak Roadie DA-G Hand Pump with Gauge Specifications Presta compatible head with integrated dust cap Aluminium barrel Thumb lock Inflates up to 120psi Dual action pumping head Provided with 120psi gauge Side mount bracket included Size: 18.3x3.2x2.8cm Weight: 116g / 4.09 oz