10,000 PSI Air Actuated Hydraulic Treadle Pump 231 Cu. • Efficiently operate any single-acting rams up to 55 ton capacity in many industrial and construction applications • Provides up to 10,000 PSI with standard shop air supply of 90-175 PSI • Made of durable,lightweight corrosion-free aluminum • Built-in pressure by-pass system protects overload operation • User friendly foot-actuated design for easy control of moving fluid at tremendous rate. Use 3/8 NPT fluid coupler