Sunex's air/hydraulic foot pump is designed for use with single acting cylinders, reducing pumping time and effort by depressing a pedal. The foot pump provides convenient hands-free pumping and release, and its release lock function enables the pedal to be locked in the released position without having to depress and hold the pedal. A hydraulic filter prevents contaminants from entering or returning to the hose and ram. Other features include an internal overload valve and a durable aluminum reservoir.