Genuine OEM Nissan radiator cap, part number 214307999C. This cap is designed to maintain the correct pressure within the engine's cooling system, which is crucial for preventing overheating and ensuring efficient heat transfer. It sits at the top of the radiator or expansion tank. Made from durable materials to withstand high temperatures and pressure. Genuine OEM parts are manufactured to exact specifications, ensuring proper sealing and long-term reliability in the demanding environment of the engine cooling system.