Otc 20 ton low profile air/manual bottle jack – ast5304a the astro pneumatic 5304a 20 ton low profile air/manual bottle jack is designed for operating either manually or pneumatically- the air hose can swivel in any direction of connection from the air source- this item is fitted with a safety valve to prevent against overloading and the extension screw gives added height when needed- this item is speedy and versatile and since it is a hydraulic bottle jack it is far quicker than using conventional hand operated equipment- it is also much safer since air power permits one-handed operation and enables the user to watch the load more closely- the heavy duty design makes this item ideal for a wide variety of automotive truck industrial and construction work- specifications: capacity: 20t minimum height: 7 (178mm) maximum height: 12-75 (323mm) lift: 3-3/8 (85mm) screw: 2-3/8 (60mm) air pressure: 100-120psi net weight: 29-10lbs (13-2kg)