Allows Quick and easy testing for Leakage in radiator system and Quick Change of coolant. Color coded radiator test caps make it easy to choose the suitable test cap for the job. Adapters for use with most cars and trucks, import and domestic, with a test range 0 - 35 PSI. Allows testing of the radiator caps checking the original pressure release. Includes a cooling system purge & refill kit for Quick Change of coolant.