OTC Air/Hydraulic Pump with Remote Control Actuator with shop air as the energy source these pumps have the power and oil capacity (80 cu. in. the usable oil) to drive even the large 55-ton rams. They are ideal all-around power sources for dozens of body frame and alignment applications. They can be used with a variety of rams presses and hydraulic pullers operating at up to 10000 PSI. An internal relief valve protects the hydraulic components regardless of hydraulic pressure. In addition a two-stage release mechanism gives fast or metered ram return while reducing hydraulic shock. The 4021 is equipped with a 15 feet remote control cord. This pump requires 9 came at 100 PSI air pressure at the pump. It develops 10000 PSI at 100 PSI air pressure. 3/8 inch NPTF oil port. 105 cubic inch capacity plastic reservoir.