OTC Tools OTC 4016 Dualmaster Jr. Two-Stage Hand Pump w/ 2-Way Valve. Pump has extra large reservoirs - 125 cu. in. usable oil. Permits use with large hydraulic rams or in multiple small ram applications. Compact & lightweight. Provides maximum flexibility with minimum effort in a portable pump. Provides high oil volume (2.6 cu. in. per stroke) for rapid ram approach & return. Automatically switches at 300 PSI to the high pressure, low volume stage (0.16 cu. in. per stroke) for high force applications. Large, non-vented reservoir with safety relief valve to prevent over-pressurization of the reservoir. Piston stroke is 3/4". Maximum handle effort is 130 lbs. at 10,000 PSI. Equipped with a 2-way valve for use with single acting rams. Dependable power for automotive, heavy duty truck, agricultural, & construction maintenance needs.