The GB Remanufacturing Fuel Injector Kit - 135873 is a comprehensive kit designed for servicing the fuel injectors of a car. It includes a variety of products that are essential for maintaining and improving the performance of a car's fuel system. The kit contains a set of fuel injectors, which are responsible for delivering fuel to the engine in a precise and controlled manner. It also includes O-rings, seals, and gaskets that are necessary for proper installation and sealing of the fuel injectors. Additionally, the kit comes with a fuel injector cleaning solution and a specialized tool for cleaning and testing the injectors. These components work together to ensure that the fuel injectors are functioning efficiently and effectively, resulting in improved fuel economy and engine performance. Overall, the GB Remanufacturing Fuel Injector Kit - 135873 provides all the necessary components to service and maintain a car's fuel injectors, making it an essential product for any car owner.