Genuine OEM Citroen Expansion Tank Coolant Hose, part number 9809851280. This critical component is responsible for transferring coolant to and from the engine's expansion tank, playing a vital role in maintaining the cooling system's pressure and fluid levels. Made from durable, heat-resistant rubber compounds, it is designed to withstand engine bay temperatures and pressures. Using a genuine OEM coolant hose ensures correct routing geometry, material resistance, and secure connections for leak-free and efficient cooling.