ACDelco GM Original Equipment A/C Service Valves are spring-loaded valves that allow service access to the A/C system. The service valves allow the service technician to evacuate and recharge the refrigerant in the A/C system. This A/C service valve is a GM-recommended replacement for your vehicle’s original components and has been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.