Excellence, Compact and Powerful Bottle Jack for Tight Spots. 18502 is a 50-Ton low profile air actuated bottle jack. It is designed to work smoothly in small areas. The air actuated bottle jack features the air operation that greatly reduces operator fatigue and speed up the efficiency of garage work. It is equipped with the compact and powerful turbo motor US patent number: 6,012,377 to raise the load to the desired height efficiently, effortless, and safely. And, its bypass device US patent number: 5,946,912 protects the hydraulic system from over pumping damage. Also, the versatile quick connector design provides for easy removal of air hose from air motor allowing compact storage or remote operation. In addition, the chrome plated ram which gives you the longer seal life and optimum performance. - Effortless Air Operation - Compact, Powerful Air Turbo Motor - Versatile Quick Connector for Easily Remove Air Hose - Chrome Plated Ram and Built-in Bypass Device. Specifications- Capacity: 50-Ton. Minimum height: 12 in. Maximum Height: 19 in. Lifting: 7 in. Base Size: 10-7/8 in. x 7-3/8 in. GW: 138 lbs. The air source can dedicate 7.8 CFM at 110 psi to 175 psi to each jack operated. A minimum of 150 psi air pressure is required to raise rated capacity load. Material: Steel.