Rein Radiator Hose - CHR0520: Rein Automotive radiator hoses are designed to transfer glycol-based coolants to and from the radiator as well as through other components in the vehicle's coolant system. Rein hoses are made with EPDM rubber for superior heat resistance and are much stronger and more durable than conventional hoses. They are designed to withstand extreme temperature fluctuations and high pressure.