The Sierra 18-3372 Water Pump Kit Without Housing contains components that are built with precision. Designed to be interchangeable with the following: Yamaha 6E5-W0078-01-00, 6E5-W0078-A1-00, 6E5-W0078-00-00. Contains: 18-0244 Water Pump Gasket, 18-0256 Bolt, 18-3071 Impeller, 18-3170 Water Pump Housing, 18-3302 Impeller Key, 18-3344 Wear Plate, 18-7483 O-Ring, 18-7485 O-Ring.