Sierra 18-3381 Water Pump Kit without Housing The Sierra 18-3381 Water Pump Kit without Housing is interchangeable with the following: GLM 12071, Evinrude/Johnson 0393509, 0393630, Mallory 9-48205. Sierra Water Pump Kit without Housing Meets or exceeds the original equipment quality Sierra part number: 18-3381 Interchangeable with the following: GLM 12071, Evinrude/Johnson 0393509, 0393630, Mallory 9-48205