The 20 Ton Air/Manual Hydraulic Bottle Jack (Model 10446) works to lift loads up to 40,000 lbs. Designed to meet ANSI/CE standards. The jack is operated by air or can be controlled manually, includes bar for manual pump lifting. This unit features a welded base and cylinder providing exceptional strength and stability. Chrome piston and ram for added rust resistance Heat treated extension saddle screw gives 3.25 in. of additional height when necessary Return springs for faster and controlled descent Aluminum air motor Minimum height 9.6 in. Maximum height 18.75 in.