Swiftech MCP655TM 12 VDC Laing D5 Vario Pump with Speed Controller 50,000 hours MTBF (Mean Time Between Failure) equivalent to 5 years lifetime Superior 12 Volts DC convenience: plugs into the computer power supply The MCP655 can be used with full confidence in any MP servers, and high-end workstations High pressure capability of the MCP655 is particularly well adapted to high-flow systems using 1/2" ID tubing Quiet operations even at high speed thanks to new chipset controller