This durable frame pump with SwitchHitter head automatically adjusts for Schrader or Presta valve tubes, plus it shows pressure on a rotatable gauge. SwitchHitter head automatically switches between Schrader and Presta valves. Gauge body rotates for easy viewing. Durable plastic barrel with aluminum shaft to reduce flex and improve efficiency. Plunger locks to body chamber with a simple twist for secure storage. Water bottle boss frame mounting bracket included. Max pressure: 80 PSI (5.5bar)