The Antec Ku HLER H2O 920 provides maximum-performance liquid cooling for your CPU in a quick, easy-to-install package. Unlike traditional liquid cooling systems, this self-contained unit comes pre-filled & requires no maintenance. The dual 120 mm Pulse Width Modulation (PWM) fans & copper coldplate ensure quiet, efficient cooling, while the 49 mm radiator is equipped to handle high performing CPUs. Designed to unlock the maximum potential of your CPU, the Antec Ku HLER H2O 920 delivers exceptional cooling when you need it the most.