Liquid cooling kit Koolance EX2-755 12 cm Black

The Koolance EX2-755 12 cm Black is a liquid cooling kit engineered for high-capacity thermal management in desktop computer systems. This ambient liquid cooling system includes a dual 120 mm fan aluminium radiator, an adjustable-speed pump and reservoir, and multiple control options for temperature-based automation and manual adjustment. The unit is supplied in a black finish and requires user-supplied tubing, fittings and coolant to connect to cold plates or components.

Advantages

The EX2-755 delivers up to 590 W of cooling capacity with a 25°C liquid-to-ambient delta at a flow rate of 4 LPM, making it suitable for demanding CPUs and multi-component cooling loops. Fan speeds and pump speed are adjustable with automatic temperature-based control or manual selection across ten levels, while three included temperature sensors and a configurable relay provide advanced monitoring and alarm capabilities. The unit supports multiple power input options and uses standard G 1/4 BSPP threads for fittings, simplifying installation with commonly available water-cooling parts.

Suitable for

• High-performance desktop CPUs and overclocked systems
• Custom liquid cooling loops for multi-component systems
• Workstations and servers requiring consistent thermal headroom
• PC builds where a 120 mm fan radiator and black aesthetic are desired

Key specifications

• Type: Liquid cooling kit
• Radiator: Dual x 120 mm aluminium radiator
• Fan diameter: 120 mm
• Cooling capacity: 590 W (2013 BTU/hr) at 25°C liquid-to-ambient delta, 4 LPM
• Pump: 10 manual speed levels, up to 4 LPM (1 GPM)
• Radiator fan control: Automatic temperature-based or 10 manual levels
• Temperature monitoring: Three included temperature sensors with adjustable audio alarm
• Relay: Configurable trigger (NO or NC) adjustable by temperature
• Reservoir capacity: 157 ml (5.3 fl oz)
• Threading for fittings: G 1/4 BSPP on back
• Power input: 12 V DC via Molex or 110/220 V AC with separate adapter
• Weight: 3.63 kg
• Colour: Black

How to use

Install the radiator and fans in your case or external mounting location, and attach tubing and fittings to the G 1/4 BSPP ports on the unit. Fill the loop with compatible coolant and purge air by running the pump at a low speed until flow is stable. Connect power either to the computer Molex plug (12 V DC) or use the separate AC adapter if available. Configure fan and pump speed using the automatic temperature-based controls or select manual levels as needed. Position the temperature sensors near the components you want to monitor and set the audio alarm thresholds and relay behavior according to system requirements.

Usage recommendations

Use coolant and tubing materials that are compatible with aluminium radiators to prevent corrosion; follow manufacturer guidelines for coolant concentration and change intervals. When assembling the loop, ensure all fittings are tightened to specification and perform leak testing before powering other system components. For best thermal performance, maintain a steady flow rate near 4 LPM and allow the automatic controls to adjust fan and pump speeds based on measured temperatures.