Expansion Tank

The COOL by Corsair system uses a curiously designed expansion tank. This tank is to be installed into a standard 5.25” bay of your system case.

The tank is made of polyethylene and is shaped in such a way as to prevent air bubbles in the system. If positioned as intended by the manufacturer, the tank is the topmost point of the liquid-cooling system. This fact makes it easier to fill COOL with liquid.

The expansion tank has two fittings (input and output) and one more input fitting can be installed additionally (there’s a stopper instead of this fitting in the standard version of the kit). But if you connect additional water-blocks according to the intended scheme, i.e. into a gap in the existing circuit, you won’t need the additional fitting in the expansion tank.

There’s a hole in the top panel of the tank for adding liquid into the system. This hole is closed with a hermetic screw-top. Thus, the system is absolutely isolated from the outside world, and you shouldn’t fear any leakages even if you turn the system case upside down.

We should note, however, that the tank has no means to monitor leakages. It doesn’t warn the user if the level of the liquid in the reservoir has become lower. On the other hand, such situations are unlikely to happen in reality since the system is fully closed.