Add to Wishlist OTC 4021 Air/Hydraulic Pump w/ Remote Control Actuator OTC 4021 Air / Hydraulic Pump w/Remote Control Actuator With shop air as the energy source, these pumps have the power and oil capacity (80 cu. in. usable oil) to drive even the large 55-ton rams. They are ideal all-around power sources for... MSRP: $1,551.48