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Watercool MO-RA3 420 for Noctua NF-A20

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Our price:  299,95  (247,89  excl tax)
Price in points: 1240 points
Reward points: 25 points

Our MO-RA3 (monster radiator) can be considered the perfect all-round package for any use cases. Accordingly, the huge heat exchanger is not only perfect for maximum silent operation, but also works well for massively overclocked high systems. Especially in combination with the high-performance Noctua NF-A20 fans, the MO-RA3 420 performs at its best. The newly developed mounting bracket for NF-A20 fans is already pre-mounted on the radiator in this version. Due to the large M4 threads and the integrated cable routing, the installation of the 200mm Noctua fans becomes very easy. A 24/7 operation for workstations or servers are no problem for this combination. The MO-RA3 was sturdily constructed by us and also finds applications in industrial areas.  

There is no substitute for cooling surface

To adequately cool a heavy power demand, a lot of material is needed. Our MO-RA3 Monsterradi features over 36 meters of copper tube linked with more than 3 square meters of aluminum. The fin geometry has been optimized to achieve high cooling performance even at low fan speeds. To ensure a high flow rate with that much copper tubing, the tubes were arranged in 4 rows in parallel. The cooling medium passes through a total of 80 parallel rows of tubes, which are equipped with a large number of plugged fins. In addition to the well-designed cooling geometry, the powerful Noctua NF-A20 fans also ensure outstanding heat dissipation. Due to the enormous cooling surface, maximum cooling performance is guaranteed.

User-friendly and flexible

Our MO-RA3 is also very popular among watercooling novices, because the external mounting means that no bulky housing is required. Equipped with special stands, the Monsterradi can also be placed anywhere. Even wall mounting is no problem. All this combined with quick couplings, makes our MO-RA3 very flexible.

The flow-optimized connection block offers three G1/4 inch threads for variable mounting. The housing of the MO-RA3 also has various threads to attach optionally available accessories, such as our Heatkiller Tube reservoir or fan shrouds. 

With this model, both sides can be equipped with fans. This means that you can install twice as many fans and further improve the cooling performance. Apart from fans and connectors, all components required for operation are already included. Among other things, there are screw plugs to close unused connection threads, fan screws and installation Tools.

Made in Germany

All MO-RA3 components are manufactured on our own CNC machines at the WATERCOOL headquarters in Waren, Germany. Many steps of the process are manual labor and each product is finished under dual control principle. This is truly “Made in Germany”.


  • Material core: Copper (tubes), aluminium (fins),
  • Material casing: Powder-coated steel (black), polished stainless steel
  • Dimensions (L x W x H): 475.5 x 430 x 65 mm
  • Weight: approx. 7700 g
  • Pressure tested: 5 bar
  • Threads: 6x G ¼” (DIN ISO 228-1)


  • 1x MO-RA3 420 LT black
  • 16 x M4 Scres for Fans
  • 4x Screw Plug G ¼”
  • Assembly tool
  • 1x Manual

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