Manual Fuel Injector Cleaning Tool: This tool connects to a 12V power supply and is suitable for most fuel injector models. When used with detergent, it allows you to see gasoline flow through the nozzle, helping identify faults like clogs or leaks. Comes with 4 O-ring seals for improved connectivity. Diesel Fuel Nozzle Adapter: Features two circular hole diameters (14 mm and 11 mm) to fit various injector sizes, making troubleshooting easier. Use with carb cleaner for effective cleaning. Battery Crocodile Clip: The red clip is positive, the black is negative, with a maximum opening of 25mm for a strong grip. Note: Black clip stays on battery, red clip touches briefly for power. Avoid continuous use over 10 seconds. Extended Connecting Wire: An 80cm long wire wrapped in high-quality insulating rubber to prevent leaks and ensure safety. Wide Compatibility: Compatible with any 12-24V car, motorcycle, EV, boat, etc. (except cylinder direct injection nozzles). 4 O-ring seals included for added value.