OTC 4022 Air/Hydraulic Pump with 2-Gallon Reservoir This pump has the power and oil capacity to drive even the large 55-ton rams Ideal all-around power sources for dozens of body frame and alignment applications Can be used with a variety of rams presses and hydraulic pullers operating at up to 10000 PSI Internal relief valve protects the hydraulic components regardless of hydraulic pressure Two-stage release mechanism gives fast or metered ram return while reducing hydraulic shock