Hydraulic Hand Pump, Reservoir Capacity 40 Cubic Inches, Maximum Pressure @ First Stage 10000 PSI, NPT Port 3/8 Inch, Speed Single, Displacement per Stroke Ist Stage 0.16 Cubic Inches, Length 23 1/32 Inches, Height 4 11/16 Inches, Width 5 1/4 Inches Hydraulic Hand PumpsUse in horizontal or vertical position with head downward. Internal pressure relief valve. 4Z480, 18Y533, 4Z481, 4YDY5, 4YDY6, and 4PU57 are steel construction. 18Y532 is aluminum construction. 6W461, 6W462, and 3KD31 are composite construction with fiberglass handle. 2-stage pumps have high flow at low pressure and low flow at higher pressure. All units are shipped with oil.Hand and Foot Pumps