Sierra 18-3380 Water Pump Kit Without Housing Sierra Water Pump Kit Without Housing Contains: 18-2705 Oil Seal, 18-2709 Wear Plate Gasket, 18-3055 Impeller, 18-3136 Bolt, 18-3337 Grommet, 18-3343 Wear Plate, 18-3365 Bolt, 18-7134 O-Ring Sierra part number: 18-3380 Interchangeable with the following: GLM 12211, Evinrude/Johnson 0390770, 0439077