Dayco 70537 Curved Radiator Hose Made with synthetic EPDM rubber compounds that provide resistance to deterioration from ozone, coolants, and temperature variations of -40F (-40C) to +257F (+125C) The inner base tube is reinforced with knitted rayon for maximum strength and burst resistance for the life of the hose Meets SAE J20R4, Class D-1 requirements for improved service hose Meets Type EC electro-chemical requirements as specified in SAE J1684; which eliminates premature deterioration of the inner tube caused by the build up of static electric charges