Professional Safety Release Radiator CapWith a full line of more than 300 budget-friendly part numbers, ACDelco has a Thermostat and Cap for virtually any GM vehicle on the road today. Engineered to work with your car, truck or SUV, ACDelco Professional Thermostats come in a variety of designs and temperature ratings to meet your needs. We also have gas caps, radiator caps and oil filter/breather caps to replace your worn original equipment.ACDelco Professional Safety Release Radiator Caps allow you to release pressure prior to taking off the cap. Available for all GM models. Represents a significant safety upgrade at any point in the vehicle's life.