Sierra 18-3586 Circulating Water Pump The Sierra 18-3586 Circulating Water Pump is interchangeable with the following: Indmar 66501, Johnson Pump 10-24228-1, Mallory 9-45800, Pleasurecraft RA057023, Volvo Penta 841640, 857451. Each Sierra product meets or exceeds the original equipment part it replaces. Sierra Circulating Water Pump Use with: 18-3081 Impeller Pump or 18-3081D Impeller Kit Sierra part number: 18-3586 Interchangeable with the following: Indmar 66501, Johnson Pump 10-24228-1, Mallory 9-45800, Pleasurecraft RA057023, Volvo Penta 841640, 857451