2003-2015 Cummins 5.9L/6.7L Injector Brush Kit (AP0083)When replacing the injectors in your 03 15 Cummins, its a very good idea to clean the injector bore and seat as part of the process to eliminate the possibility of old debris finding its way into your engine, causing irreparable damage. This complete injector brush kit should be a necessity for anyone pulling and swapping injectors, even once!