Genuine OEM Audi Coolant Hose With Coupling, part number 2K0121156J. This vital assembly is responsible for transporting coolant throughout the engine cooling system, maintaining optimal engine operating temperatures. It consists of multiple hoses integrated with a coupling for precise routing and connection. Constructed from high-quality, heat-resistant rubber and durable plastic, it is designed to withstand extreme temperatures and pressures. Choosing a genuine OEM coolant hose ensures exact fitment, leak-free connections, and resistance to degradation, which are critical for preventing engine overheating and costly damage.