The AST FZ25 Cooling System Pressure Tester Radiator Cap Adapter is designed for testing the cooling system of vehicles. It is a crucial tool for diagnosing any leaks or pressure issues in the radiator system, ensuring the proper functioning of the vehicle's cooling system. This product does not come with a warranty. Fits BMW, Ferrari, Fiat, Infiniti, Jeep, Land Rover, Mini, Nissan, Ram Trucks, Smart and Volvo vehicles …. See photo for years and models.