With this, your system is operating at the ultimate level and you are now able to cold crash and lager (to as low as 4°C (39°F)).
The Glycol Chiller connects to the hidden stainless steel sleeve inside the double-walled fermenter and runs glycol through it to chill the stainless steel and therefore your wort down to your dialed-in temperature on your temperature controller.
Please note that this is a specialty item that needs to be ordered in.