OTC 4025 Air / Hydraulic Pump with shop air as the energy source (with metal reservoir). This pump has the power and oil capacity (80 cu. in. usable oil) to drive even the large 55-ton rams. It's an ideal all-around power source for dozens of body, frame, and alignment applications. It can be used with a variety of rams, presses, and hydraulic pullers operating at up to 10,000 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.