Genuine OEM Volkswagen seal, part number 03H121091A. This seal is a critical component within the engine cooling system, designed to prevent coolant leaks from hoses or connections. It is located in the cooling system plumbing. Manufactured from high-quality rubber or composite materials for durability and resistance to heat and coolant. Genuine OEM parts are designed for exact fitment and reliable operation, ensuring the integrity of the engine cooling system.