Genuine OEM Nissan Radiator Pipe, part number 21537JD00A. This pipe is a component of the engine cooling system, designed to facilitate the flow of coolant between various parts of the system, such as the radiator and engine block. It is positioned within the cooling circuit. Manufactured from materials resistant to heat and pressure to ensure durability. Genuine OEM pipes provide exact routing and material specifications, crucial for the efficient operation and longevity of the cooling system.