This product is a Genuine BMW A/C Refrigerant Hose with the part number 64538377678. It is designed for use in BMW vehicles and is used to transport refrigerant for the air conditioning system. This hose is an important component in maintaining proper cooling and functionality of the A/C system. It is made with high-quality materials to ensure durability and performance. This product is an authentic BMW part and is recommended for use in BMW vehicles for optimal performance.