Genuine OEM Audi Engine Coolant Hose, part number 8K0121104E. This hose is an integral part of the engine's cooling system, responsible for transporting coolant to and from various engine components to regulate temperature. It ensures efficient heat exchange and prevents the engine from overheating, which is vital for its longevity and performance. This hose is positioned within the complex network of coolant lines around the engine. It measures approximately 0.225 meters in length and weighs 0.087 kg. Genuine OEM hoses are designed with specific bends and material compositions to withstand high temperatures and pressures, ensuring a perfect fit and leak-free operation.