The Hitachi Fuel Injector Kit - 135916 is a comprehensive kit of products designed to service the fuel injectors of a car. It includes various components such as fuel injector o-rings, seals, gaskets, and other necessary hardware. The kit is designed to improve the performance and efficiency of a car's fuel system by ensuring proper fuel delivery to the engine. It is suitable for a wide range of car models and is a cost-effective solution for maintaining the fuel injectors. The kit is easy to use and comes with detailed instructions for installation. It is an essential kit for any car owner looking to keep their fuel system in top condition.