This durable frame pump features a SwitchHitter head that automatically adjusts for both Schrader and Presta valve tubes, making it compatible with virtually any bike. The rotatable gauge body allows for easy pressure viewing from any angle. The pump is constructed with a durable plastic barrel and aluminum shaft to reduce flex and improve pumping efficiency. The plunger locks securely to the body chamber with a simple twist, making it convenient for storage and transport. A water bottle boss frame mounting bracket is included for easy attachment to your bike frame.