RE-A Compact style Rotary Hydraulic Cylinder with Air Connection and Safety Device For short form, light weight and high speed rotary cylinder. To allow compressed air to be feed from the rear end of the distributor through the rotating union. Built-in safety check valves, pressure relief valves and proximity sensor. Can screw it from the rear end of the cylinder when mounting. For short form, light weight and high speed rotary cylinder. To allow compressed air to be feed from the rear end of the distributor through the rotating union. Built-in safety check valves, pressure relief valves and proximity sensor. •Can screw it from the rear end of the cylinder when mounting.