Topeak JoeBlow Sport 2Stage has a unique 2-stage design delivers both high pressure and high volume in record time. Stage one opens both barrels for huge volume reaching 30 psi with 30% less effort than standard floor pumps. Stage two utilizes the small barrel for pressures up to 160 psi. Hammer type TwinHead(TM) DX5 pump head with an extra-long and tangle-free hose makes it easy to reach valve stems.2 Stage Technology: Delivers both high pressure and high volume in record time3" easy-to-read mid-mounted analog 2-stage precision gauge