Genuine OEM Volkswagen Coolant Hose, part number 5C0121109C. This hose is a critical component in the engine's cooling system, facilitating the flow of coolant. It is positioned in the coolant circuit as indicated by number 8 on the diagram. Made from durable rubber, it is designed to withstand engine temperatures and pressures. Genuine OEM coolant hoses are manufactured to precise specifications, ensuring correct fitment and long-term reliability to prevent engine overheating.