Sierra 18-3385 Water Pump Kit Without Housing Sierra Water Pump Kit Without Housing Contains: 18-2705 Oil Seal, 18-3337 Grommet, 18-3368 Impeller, 18-3369 Bolts, 18-7481 O-Ring, 18-3343 Wear Plate, 18-7134 O-Ring, 18-3365 Bolts Sierra part number: 18-3385 Interchangeable with the following: GLM 12221, Evinrude/Johnson 0396932, 0439077