Astro 5304 Low Profile Air/Manual Bottle Jack - 20 Ton Load Capacity Designed for operating either manually or pneumatically Air hose can swivel in any direction of connection from air source and is fitted with a safety valve against overloading Extension screw gives added height when necessary Speedy and versatile, air/hydraulic bottle jack is far quicker than using conventional hand operated hydraulic equipment and much safer Heavy duty design makes them ideal for a wide variety of automotive, truck, industrial and construction work