The Schley Products Duramax LLY, LBZ, and LMM Injector Puller Kit, No. 13300, helps technicians remove the diesel injectors from GM vehicles produced from 2005 to 2010 with an LLY, LBZ or LMM Duramax engine. Over time and miles the injectors become heavily coated with carbon between the tip and head, causing them to stick together. According to the company, a factory tool will rock the injector, binding it into the head. This may damage the injector end. The 13300 will pull the injector straight out without rocking, which reduces the possibility of damaging the injector or head.