The Antec K HLER H2O 650 delivers high-performance liquid cooling for your CPU in a quick, easy-to-install package. Unlike traditional liquid cooling systems, this self-contained unit comes prefilled and requires no maintenance. In addition to easy installation, a powerful PWM fan pushes air through directional blades and channels it for optimal cooling. Engineered for maximum performance, the Antec K HLER H2O 650 delivers liquid cooling performance at an air cooling price.