Check the listing for details. EKWB EK-Loop DDC 4.1 PWM Motor. Condition: New. Listed at 81.99 USD. EK-Loop DDC 4.1 PWM Motor is a custom loop water pump with power management control (via PWM - pulse width modulation) of rotation speed through motherboard BIOS or a dedicated fan controller. This is a low-power version of the full DDC pump carrying both power and PWM control through the fan 4-pin header. It features the exact same physical characteristics on the outside as the EK-Loop DDC 4.2 PWM Motor, which is the high-power version. This pump is compatible with any EK-Quantum Kinetic TBE DDC and FLT DDC pump-res combo units. using an optional Convection heatsink can even further prolong the lifespan of the pump. Despite a remarkably small footprint of 2.4" square, EK-Loop DDC 4.1 PWM features a respectable 2,6m of head pressure. This is more than adequate for usual loops that feature one or two water blocks and no QDCs or other flow-restricting components. This pump is also a high-reliability, high-pressure industrial pump featuring a 50,000-hour MTBF (5-year lifetime) and using only 6W of power. It's compact, quiet, energy-efficient, and quite capable while not requiring additional power connectors. Technical Specifications: - Dimensions (W x D x H): 90 x 62 x 38mm - Motor: Electronically commuted ball bearing motor - Rated voltage: 12V DC - Power consumption: 6W - Maximum head pressure: up to 2.6m - Maximum flow rate: up to 500L/h - Maximum liquid temperature: 60 degrees C - Materials: Stainless steel, PPS-GF40, EPDM O-rings, Aluminium oxide, hard coal - Power connector: 4-pin PWM FAN connector for PWM / RPM readout and power