Genuine OEM Volkswagen Seal, part number 2Q0201558. This seal creates a watertight seal for coolant system components to prevent leaks. It is positioned as part 18 in the diagram. The seal measures 0.9 meters in length, 0.027 meters in width, and 0.015 meters in height. Genuine OEM seals are critical for maintaining the integrity of the coolant system, preventing leaks and ensuring optimal performance.