RE-L Compact style Rotary Hydraulic Cylinder with Coolant Connection and Safety Device For short form, light weight and high speed rotary cylinder. To allow coolant to be feed from the rear end of the distributor through the rotating union, suitable for vertical lathe. Built-in safety check valves, pressure relief valves and proximity sensor. Can screw it from the rear end of the cylinder when mounting. The drain port should be independently connected to oil tank to avoid back pressure.