The heart of the H20-120 Rev.2 system is the MCP650 12VDC pump which is a replacement for the now discontinued MCP600 model. The MCP650 is an inline centrifugal pump with 1/2" barb fittings and a brushless motor for quiet operation. The pump receives power via a 4-pin Molex connector that can attach directly to a computer power supply. One advantage of using this particular type of pump is that the unit powers on simultaneously with the system without the need for solid state relays or any case modification. There are two different methods of installing the MCP650 inside any mid-tower case. Swiftech recommends using either the built-in adhesive neoprene pad or permanently bolting the unit to the bottom of the case using the supplied screws and bolts.