Ideal all-around power source for dozens of body, frame, and alignment applications develops 10,000 PSI of hydraulic pressure at 100 PSI air pressure Pump, hold, or release load using simple pedal control - great unit for use with a wide variety of rams, presses, and hydraulic pullers operating at up to 10,000 PSI Built-in internal relief valve protects the hydraulic components regardless of hydraulic pressure Convenient 2-stage release mechanism gives fast or metered ram return while reducing hydraulic shock.1/4 inch NPT Air Inlet Features a 98 cubic inch useable capacity and 3/8 NPT oil port; unit requires 9 cfm of air at 100 PSI (at the pump)