Genuine OEM Lexus Upper Radiator Hose, part number 1657136241. This hose is responsible for transporting coolant between the engine and the radiator, forming a critical part of the engine's cooling system. It is specifically the upper hose in the assembly. Manufactured from high-quality rubber, it guarantees durability and consistent performance. Genuine OEM parts are vital for radiator hoses to maintain the correct shape and material properties, ensuring a secure fit and efficient coolant circulation.