Genuine OEM Hyundai Exhaust Valve, part number 222122M805. This critical engine component is responsible for sealing the combustion chamber during the compression and power strokes, and then opening to allow spent exhaust gases to exit the cylinder. It operates within the cylinder head, precisely timed by the camshaft. Using a genuine OEM exhaust valve ensures correct material composition, heat resistance, and precise dimensions for optimal engine performance, efficiency, and longevity.