Used for Replacing Teflon Seals on Most Hitachi, Bosch, Continental and Delphi Fuel Injectors Found on Many Ford, GM and Subaru Engines. It also works on many Ford ECO injectors with direct injectors.The pilot cone is placed onto the end of the injector, and the seal is started over the cone. The installer is used to push the seal over the remainder of the cone and into the grooveon the injector tip. The sizer is then placed over the seal to compress it back to the correct OD to allow installation into the cylinder head. Applications include: 2010 and later GM engines including 1.4L, 1.5L, 2.0L, 2.4L, 2.5L, 3.0L, 3.6L, 4.3L, 5.3L, and 6.2L. 2010-2017 GM 2.0L, 2.5L, 3.6L, 5.3L & 6.2L engines. 2014-2019 Subaru 2.0L & 2.4L turbo engines. Ford injectors 2011 and newer. Fits 6 & 7.5mm stems.