Genuine OEM Nissan Engine Coolant Reservoir Hose, part number 217411KB0A. This hose connects the coolant reservoir to the engine's cooling system, allowing for proper coolant circulation and overflow management. It is positioned between the reservoir and the radiator or engine block. Made from durable, heat-resistant rubber. Genuine OEM hoses are specifically designed to withstand engine temperatures and pressures, ensuring reliable coolant flow.