MODTHEBOX.COM published a review on the Corsair Nautilus 500 External Water Cooling solution

While Corsair’s earlier external water cooling kit "The HydroCool 200" was quite bulky, the Nautilus 500 is much more compact, streamlined, and lighter. Made of plastic, the central unit looks very neat and clean. The high density polyethylene reservoir can be seen from the front, which glows green when powered. A metal filler cap is used on the top, as well as a 120mm exhaust fan with protective grill. The rear of the unit is also clean, with inlet and outlet quick connect ports, power cable and fan speed selector switch.

Corsair Nautilus 500 External Water Cooling Review