This product is a genuine BMW water hose designed for use in 318i, 318is, 318ti, and Z3 models. The part number is 11531247398. It is a high-quality replacement hose that is specifically designed to fit and function like the original equipment. This hose is essential for the proper functioning of the vehicle's cooling system, ensuring that the engine stays at a safe operating temperature. It is made from durable materials and is built to withstand the rigors of daily use. This water hose is an OEM (Original Equipment Manufacturer) part, ensuring the highest level of quality and compatibility with your BMW vehicle.