The GB Remanufacturing Fuel Injector Kit - 135872 is a comprehensive kit designed for servicing the fuel injectors in a car. It includes three essential components: a fuel injector, an O-ring, and a seal. These parts are essential for ensuring proper fuel delivery and maintaining optimal engine performance. The fuel injector is responsible for delivering the correct amount of fuel to the engine, while the O-ring and seal help to prevent leaks and maintain a secure seal. This kit is suitable for use in a variety of car models and provides a cost-effective solution for maintaining fuel system functionality.