This durable frame pump with switchhitter head automatically adjusts for schrader or presta valve tubes and shows pressure on a rotatable gaugeswitchhitter head works on schrader or presta valves with no disassemblygauge body rotates for easy viewingdurable plastic barrel with aluminium shaft to reduce flex and improve efficiencyplunger locks to body chamber with a simple twist for secure storagewater bottle boss mount includedmax pressure 120psi 83barvolume per stroke 484cc