The Bosch Fuel Injector O-Ring - 6002ER1003 is a small rubber ring designed to fit around the fuel injector in a vehicle's engine. It creates a tight seal between the injector and the fuel rail, preventing leaks and ensuring proper fuel delivery to the engine. This o-ring is made by Bosch, a trusted brand in automotive parts and is compatible with a variety of vehicle makes and models. It is a crucial component in maintaining the efficiency and performance of a vehicle's fuel system.