OTC Tools OTC 4004 Two-Speed Cobra Hydraulic Hand Pump. OTC Tools. Use with single-acting hydraulic rams. Rugged all-metal construction. Maximum handle effort is 90 lbs. Two-speed action provides rapid approach of ram piston to the work. An appropriate and economical power source for applications in which 20 cu. in. of usable oil is adequate. Specifications: Maximum operating pressure 10,000 PSI Volume per stroke (first stage) .305 cu. in. Volume per stroke (second stage) .091 cu. in. Reservoir capacity 24.4 cu. in. Oil port 3/8" NPT Email for product availability.