We are currently unable to ship orders from WA State through April 9th due to a government-mandated shutdown for COVID-19. Orders shipping from Koolance Korea, manufacturing, and development are unaffected during this period.

We will continue to answer email. Backorders can still be placed through our website, which will be shipped once restrictions are lifted. (Payment is required for backorders later when they are being prepared.)



EXT-440CU Computer Liquid Cooling System, Rev2.0

Part No. EXT-440CU Out Of Stock Expected Apr 06
Volume Pricing
2 : $291.26
5 : $282.52
10 : $278.15
20+ : $273.79
RoHS CertifiedREACH Certified

EXT-440CU is a compact ambient liquid cooling system designed with features for computer cooling. This model contains a single x 120mm fan copper/brass radiator, providing roughly 400W of cooling with a 25°C ambient delta. Just add tubing, fittings, coolant, and connect to your cold plate(s).

  • Cooling capacity: 400W (1365BTU/hr) with 25°C liquid-ambient delta @ 4.5LPM
  • Radiator fan speed: automatic based on temperature, or 10 manual levels
  • Pump: 10 manual levels, up to 4.5LPM (1.2GPM)
  • Adjust audio alarm based on 3 included temperature sensors
  • Relay trigger can be adjusted based on temperature
  • Power input: 12VDC (via computer Molex plug), or 110/220VAC with separate adapter
  • Reservoir capacity: 157ml (5.3 fl oz)
  • G 1/4 BSPP threads on back for fittings

Weight 5.50 lb (2.49 kg)
Fitting Thread G 1/4 BSPP
Max Pressure @ 25°C 2kgf/cm2 (28.5psi)
Max Temperature 60°C (140°F)
Noise (dBA) 32-44
Cooling Systems
Cooling Capacity 400W (1365BTU/hr) @ 25°C liquid-ambient (25°C dT)
Display Type LED
Flow Rate 4.5LPM (1.2GPM)
Max Power Consumption 17W
Power Source 12 VDC (110/220 VAC with Separate Adapter)
Radiator Brass/Copper, 1 x 120mm fan
Temperature Sensors 10K Thermistors
Diagrams / Models (See Files Tab for Diagrams and 3D Models)



Liquid Coolants

Koolance's product warranty does not cover the use of 3rd-party coolants, coolant additives, or corrosion. Koolance LIQ-702 or LIQ-705 coolants are strongly recommended to help avoid issues with mixed metals or biological growth. Additionally, do not use aluminum with bare (unplated) copper or bare (unplated) brass in the same system. Do not use silver with nickel in the same system.