Laing D5 high-performance water pump motor with manual speed control via adjustable knob. This product is compatible with any EK-D5 pump top and pump reservoir combo unit. This pump is ideal for PC and other electronics water cooling. The D5 pump is equipped with an electronically commutated spherical motor. In a pump with a spherical motor the only moving part is a spherically shaped rotor which in this pump is held in place by a bearing ball made of ultra-hard and wear-resistant ceramic. Rated 50.000 hrs MTBF at 25 degree C ambient!