Pink Quick-On Fuel Cap Tester Adapter (31462) by Gates®. Gates' Fuel Cap Tester can be made to be compatible with nearly any vehicle on the road with the correct adapter. This product is designed and manufactured to help you keep the fuel system of your vehicle in mint condition. It will make fuel system maintenance easier and more convenient, saving your time and protecting you from unplanned expenses. It will help you find the problem quickly, and fix it as soon as possible.