This BMW Original radiator hose, part number 11537785018, is designed for use in the E39 525d, 530d models. 
 
It is a water hose that connects the engine block to the radiator and is responsible for circulating coolant through the engine to keep it at the appropriate operating temperature.
 
The hose is made of high-quality materials to withstand the high temperatures and pressures of the engine's cooling system, ensuring long-lasting performance and durability. 
 
It is a Original BMW part, ensuring a perfect fit and reliable function for your vehicle.