Revain claimed it would fit my car when it didn't. I tried to research and test this before buying but there is no information to make this possible. There is no mention of the need for an adapter, and I couldn't find any information about the adapter when I specifically searched for one. I know the inside diameter and depth of the radiator cap, but the manufacturer of this product does not provide any information for comparison. The manual that comes with the pressure tester contains a list of