Triple-Bag Air Jack Herkules Air Jacks have designed-in features that make them the safest and best value in vehicle lifting jacks. An internal stabilizing cylinder ensures stable, solid positioning. Dual safety valves prevent both over-inflation and uncontrolled deflation.. 4500 lb. Lifting capacity. 7.875 Lowered height. 19.25 Raised height. 90-110 psi Air Pressure Requirement. Internal stabilizing cylinder. Portable, simple and safe. Compact and lightweight. Balanced handle for ease of positioning. Strong, fast and efficient AJ3 No -