1 lb7 Injector Tube/Cup Installer/Remover. FitsGM 6.6L Duramax Diesel, 2001 to present. Works on GM 6.6L Duramax Diesel 2001 to present. Removes injector sleeves for service and re-installs. No need to remove any rocker arms or valve springs, just fully seat the tool in the injector.