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I want to change my Elise's coolant myself, and purchased a Stant pressure tester (Amazon.com: Stant Inc. 12270 Cooling System and Pressure Cap Tester Set: Automotive) to enable me to do this as per the shop manual instructions. I thought I had purchased the right adapter, 12027, but was wrong. Does anyone know which Stant adapter fits the Elise? At this point I'm guessing 12025, but am hoping for more confidence before ordering yet another adapter...