The Hitachi Fuel Injector Kit - 135913 is a comprehensive kit designed for servicing the fuel injectors in a car. It includes a set of three products, each specifically chosen to effectively clean and maintain the fuel injectors in a vehicle. The kit contains a fuel injector cleaner, a fuel injector seal kit, and a fuel injector o-ring kit. These products work together to remove any buildup or debris from the fuel injectors, replace any worn or damaged seals, and ensure a proper seal for the injectors. This kit is suitable for use on various types of cars and can help improve the overall performance and efficiency of the fuel system.