OTC Tools OTC 4025 Air / Hydraulic Pump W/Metal Reservoir. OTC Tools. With shop air as the energy source, these pumps have the power and oil capacity 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. Develops 10000 PSI at 100 PSI air pressure. 3/8 inch oil port. 98 cu. in. usable oil capacity in metal reservoir. Email for product availability.