Suitable for W166 , meeting the assembly requirements of radiator coolant hoses. Corresponding to numbers 1668304096 and A1668304096, they can be directly replaced and used. Undertake the function of coolant delivery and connect the radiator with the engine cooling system components. Assist in ensuring smooth circulation of coolant and maintaining normal engine operating temperature. Corresponding to the radiator coolant hose, it supports the normal operation of the vehicle cooling system.