OTC 4321C 20 Ton Capacity Air-Assist Hydraulic Bottle Jack Compact yet heavy-duty units designed for the truck and construction industries in the shop roadside or at the job site Can be operated either manually or pneumatically Air hose can swivel in any direction of connection from air source Extension screw gives added height when needed 20-Ton capacity air assist jack with a maximum height 17-11/16 inch