OTC Injector Puller for GM Duramax engines - similar to Kent Moore J-44639 For use on 2001-2004 model year GM Duramax 6.6L engines Safely pulls the injectors from the cylinder heads without pulling the injector cups Simply insert the tool into the injector retainer bracket bolt hole, attach a socket and ratchet/breaker bar to one of the hex ends and start rocking back and forth - the injector will pop right out Durable steel construction means tool will withstand heavy shop use and continue to perform as designed