EK-XTOP Revo Dual D5 PWM Serial - (incl. 2x pump) The EK-XTOP Revo Dual D5 PWM Serial comes pre-installed with two (2) EK-D5 PWM water pumps operating in series. Using two water pumps in series provides almost twice the head pressure of a single water pump and also guarantees top safety measure - in the case of one pump fails the remaining one will provide sufficient liquid flow to prevent any hardware damage due to overheating. The included mounting mechanism, and self adhesive mounting pattern, make installion very simple. EK-XTOP Revo Dual D5 can be paired with EK-RES X3 150 Lite reservoir. Power connector: 2 x 4-Pin Molex- and 2 x 4-Pin PWM FAN connector