Genuine OEM Audi Engine Coolant Pipe, part number 4M0121131C. This pipe is a critical component of the engine cooling system, responsible for carrying coolant between various engine components and the radiator. It is typically positioned horizontally across the front of the cooling assembly. Constructed from durable materials to withstand high temperatures and pressures, it weighs approximately 0.185 kg and measures 0.7 meters in length. Using a genuine OEM coolant pipe ensures precise routing, leak-free connections, and resistance to thermal cycling, which is vital for the longevity and performance of the engine's cooling system.