ACDelco Professional premium aftermarket Molded Coolant Hoses are composed of specially blended materials to help resist electrochemical degradation (ECD) the leading cause of hose failure. They are specially designed GM OE style factory-molded hoses to fit today smaller tighter-fitting engine compartments. ACDelco Professional Molded Coolant Hoses are temperature rated from -40 degrees Fahrenheit to 275 degrees Fahrenheit (-40 degrees Celsius to 135 degrees Celsius) and are approved for Marine applications. Do not use for fuel or oil transfer applications. These premium aftermarket replacement molded coolant hoses are manufactured to meet your expectations for fit form and function.