NOTE: there has been some confusion regarding the correct usage of this puller. Reviewers that mention the tube not fitting are attempting to put the tube over the injector hold down nut. This is incorrect. The injector hold down nut is loosened and removed, then the puller tube will slide down all 89-98 B-series Cummins 12 valve or 8 valve 4BT injectors. Simply remove the injector nut, slide the tube down, place the washer, and tighten the nut to pull. Once the injector moves out of the bore you can pull it out. We suggest using Kroil around the injectors as it will get into the tightest spots and allow for a smoother pull.