ACDelco GM Original Equipment A/C Expansion Valve Tubes carry the liquid refrigerant from the outlet of the condenser to the inlet of the expansion valve. The tubes are made of corrosion-resistant aluminum and are GM-recommended replacements for your vehicle’s original components. The tubes may include service ports depending on application and are specifically designed for service equipment and the particular refrigerant used. This original equipment expansion valve tube has been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.