Designed for operating either manually or pneumatically. Heavy-duty steel construction meets ANSI standards. Air hose can swivel in any direction. Fitted with safety valve to prevent overloading. Two-piece handle allows for easy pumping. Extension screw gives added height when necessary. Double spring return. Min. height: 10 3/16in. Max. height: 19 7/8in. Available air pressure: 80 PSI to 120PSI. 20 ton lifting capacity.