This is a modified version of the Via Aqua CC25B aquarium chiller. It is modified for controlled water cooling to 0 celsius! What makes this unit so special is the temperature can be regulated as low as just above freezing. Unlike other cpu refrigeration systems, this one allows ANY AND ALL CPU, video card, chipset, ram, HD to be cooled to extreme cold temperature for maximum overclocking potential. To complete the system you will need: Waterblock(s) for devices to be cooled Pump Reservoir - for bleeding air 1/2" tubing to connect it all We recommend a small amount of antifreeze or alcohol be added to the coolant. Remember to use condensation prevention measures on the chips being cooled! Please allow up to 5 extra working days to prep the unit for the modification.