Dayco® Molded Radiator and Bypass Hose with knitted reinforcement and all-synthetic EPDM construction provides the high 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 hose replacements. The inner base tube is reinforced with knitted rayon to provide maximum strength and burst resistance for the life of the hose. In addition to meeting SAE J20R4, Class D-2 requirements, this hose is now designed to meet Type EC electrochemical requirements as specified in SAE J1684. Note: Heavy-Duty Truck Molded Radiator Hose carries an SAE J20R4, Class D-1, Type EC classification.