Sierra 18-3387 Water Pump Kit without Housing The Sierra 18-3387 Water Pump Kit without Housing is interchangeable with the following: GLM 12246, Evinrude/Johnson 0432956, 0432955. Each Sierra product meets or exceeds the original equipment part it replaces. Sierra Water Pump Kit without Housing Meets or exceeds the original equipment quality Sierra part number: 18-3387 Interchangeable with the following: GLM 12246, Evinrude/Johnson 0432956, 0432955