5.2 LITER. Pressure hose washer. A flat disc with a hole in the center that is placed between the power steeRing return line and the steeRing gear to provide a seal to prevent the escape of power steeRing fluid. An item used to seal the fitting between the oil cooler and the oil cooler Hose. Power SteeRing Hose O-Ring. Automatic Transmission Oil Cooler O -. Connector o -. Cooler line o -. Power Stee Return. Pressure o -. Seal.