... on 4 wheels base frame and covered steel frame.3 Single axle trailer type: mounted on chassis with 2 pneumatic tires ... , hand brake, rear lights, tow-eye etc. (oil Purifier, oil filter, oil recycling, oil refine, reclamation, degassing, dehydration, insulation oil, transformer ... , purification, low viscosity lubrication oil, super high voltage) double stages Vacuum Insulation Oil Filter Machinery