Genuine BMW Automatic Transmission Oil Cooler Hose - 17221744459 - This genuine BMW automatic transmission oil cooler hose is designed to replace the original part on your BMW vehicle. It is made from the highest quality materials to ensure a reliable and long-lasting service life. This hose is designed to keep your transmission cool and prevent it from overheating. It is a direct fit replacement for the original part and is backed by a manufacturer's warranty.