This Sunex Air/Hydraulic Jack features a 20-ton capacity, 5 inch composite wheels, integrated filter to protect air motor and a narrow chassis design that fits easily between tandem wheels. Lift Capacity (tons): 20, Min. Lift Height (in.): 8 39/64, Max. Lift Height (in.): 23 5/16, Operation: Air/hydraulic, Working Pressure (PSI): 100, Safety Valve included.