For Kohler Marine Diesel Generators that have a 2.75" Cover. Pump numbers are 256504 , GM35622 , GM35638 Models: 11CCFOZ, 11.5CCFOZ, 13.5CCOZ, 14CCOZ, 13EOZ, 14EOZ, 15.5EOZ, 11EFOZ, 11.5EFOZ, 13EFOZ, 17.5CCFOZ, 20CCFOZ, 23EOZ, 16EFOZ, 17.5EFOZ, 18.5CCOZ 18.5CCOZ 20CCOZ 24CCOZ 15CCFOZ, 24EOZ, 19EFOZ, 20EFOZ, 20EOZ Replaces Kohler: 252834 oil filter 229955 impeller kit 252898 fuel filter Impeller Specifications: Diameter: 50.8mm ( 2" ) Width: 22.1mm ( 7/8" ) Shaft: 12.7mm ( 1/2" ) 6 Blades Maintenance Service Kit Fits Kohler Marine Diesel Generators. Includes: Oil Filter, Fuel Filter and Impeller Kit. Brand may be Sierra , Kohler , Napa , Lubefinder or Aftermarket. For Kohler Marine Diesel Generators that have a 2.75" Cover. Pump numbers are 256504 , GM35622 , GM35638 Models: 11CCFOZ, 11.5CCFOZ, 13.5CCOZ, 14CCOZ, 13EOZ, 14EOZ, 15.5EOZ, 11EFOZ, 11.5EFOZ, 13EFOZ, 17.5CCFOZ, 20CCFOZ, 23EOZ, 16EFOZ, 17.5EFOZ, 18.5CCOZ 18.5CCOZ 20CCOZ 24CCOZ 15CCFOZ, 24EOZ, 19EFOZ, 20EFOZ, 20EOZ Replaces Kohler: 252834 oil filter 229955 impeller kit 252898 fuel filter