The Specialized Air Tool Flex Hose Pump uses an inverted camber design that allows for quick fill-up on mountain tyres but can still reach the high pressures needed for road tyres. Specialized Air Tool Flex Hose Pump Features  Twin Schrader and presta thread on T-head Inverted barrel design allows for efficient high volume and high pressure pumping Lightweight and compact hose with built-in flex to prevent excess stress on valve stems Water bottle boss mount included