Genuine OEM Audi Engine Coolant Pipe, part number 4K0121400E. This pipe is an essential component of the engine cooling system, designed to circulate coolant efficiently throughout the engine to maintain optimal operating temperatures. It is a rigid pipe, connecting various hoses within the cooling circuit. Weighing approximately 0.22 kg and measuring 0.4 meters in length, it is engineered for precise fitment and durability. Using a genuine OEM coolant pipe ensures correct routing geometry, material resistance to heat and pressure, and a leak-free connection for reliable engine cooling.