Genuine OEM Volkswagen Coolant Reservoir Seal, part number 2N0121345. This seal is essential for maintaining the integrity of the coolant reservoir, preventing leaks and ensuring the correct coolant level is maintained within the system. It is located at position 2 in the engine cooling assembly. The seal is made from a durable rubber compound. Genuine OEM seals provide a reliable, long-lasting barrier against coolant loss, critical for engine health.