Genuine OEM Audi Coolant Hose, part number 05L122157CQ. This hose is a critical component of the engine cooling system, facilitating the circulation of coolant to maintain optimal engine temperature. It connects various parts of the cooling circuit. Constructed from high-quality, heat-resistant materials, it is designed for durability and reliable operation under demanding engine conditions. Genuine OEM coolant hoses are manufactured to precise specifications, ensuring correct flow rates and resistance to degradation from heat and chemicals, which is vital for preventing leaks and maintaining engine longevity.