With this cooling system tester set, you can easily detect leaks in your car's air conditioning system, saving you time and money! Easy to use: Choose the appropriate plug for installation and then install the buckle as a fastening tool. Keep the plug in contact with the pipe head while testing and tighten the plug to prevent air leakage. This way, you can more easily check your car's air conditioning for leaks and quickly and accurately locate any leaks. Wide applications: This air conditioning leak detection tool set includes plugs and buckles in various sizes, suitable for most automotive air conditioning systems. Easy storage: All parts are housed in a plastic case for convenient storage and transport. Color: Red; Material: Metal, Rubber; Box dimensions: 36 x 27 x 9 cm (L x W x H).