Genuine OEM Citroen Cylinder Head Degassing Pipe, part number 9819359980. This flexible pipe is a crucial component of the engine cooling system, designed to allow trapped air to escape from the cylinder head area. Proper degassing prevents air pockets that can lead to overheating and inefficient coolant circulation. This black, flexible pipe is engineered for specific routing and temperature resistance. Opting for a genuine OEM degassing pipe ensures the correct material composition, internal diameter, and connection points for a leak-free and reliable cooling system.