Dayco Radiator Coolant Hose - 72318: This Dayco Radiator Coolant Hose is designed to transfer glycol-based coolants to and from the radiator as well as through other components in the vehicle's coolant system. Its EPDM tube and cover resist heat, ozone, and chemicals. It has a temperature range of -40 degrees F to 275 degrees F (-40 degrees C to 135 degrees C). It is designed to meet or exceed SAE 20R4 and 20R3 Type EC Class D-1 and D-2 specifications.