Genuine OEM Volkswagen Water Connection Sealing Ring, part number 03H121041A. This sealing ring is designed to create a tight, leak-proof connection for water lines within the engine cooling system, preventing coolant loss and maintaining optimal engine temperature. It is installed at a water connection point. Made from a durable sealing material, it measures approximately 0.05 meters in diameter. Choosing a genuine OEM sealing ring ensures exact dimensions, proper material composition, and long-term resistance to heat and coolant, preventing leaks and maintaining system integrity.