The SP Tools Duramax Injector Cup Puller, No. 16100, is designed to remove the injector cup and sleeve without causing damage to the cup on LB7 Duramax diesel engines for models of Chevrolet and GMC vehicles between 2001 and 2004. The 16100 tool is ideal for re-sealing the sleeves, which begin to leak over time. It also works efficiently, saving the technician on time.