Our Double-Acting Alligator Axle Jacks are configured and designed for normal wheel/tire and brake changes. The cylinder head comes mounted on a T- frame with three casters for ease of maneuvering and centering the jack under the jacking point. After the work has been accomplished and the release valve has been opened, the accumulator (Power-Retract�) will fully retract the rams automatically back down inside the cylinder. Optional Dual Reading Pressure Gauges are available. The Double-Acting Alligator Axle Jacks are designed and built to meet or exceed the most demanding requirements of the international ground handling market and to withstand harsh environmental conditions, rugged use and to provide many years of long and dependable service.