Dayco upper radiator hose is designed with knitted reinforcement and all EPDM construction for increased strength and resistance to oil, mud, salt, road debris, ozone, coolants, and temperature variations of -40˚F (-40˚C) to +257˚F (+125˚C) that are required for OEM radiator hose replacements. Dayco radiator hose has an inner base tube that is reinforced with knitted rayon for maximum strength and burst resistance for longer life. Besides meeting SAE J20R4, Class D-1 requirements, radiator hose by Dayco is also designed to meet Type EC electrochemical requirements as specified in SAE J168.