The GrainFather Glycol Chiller Adapter Kit (GCA) is a game - changer for homebrewers and small - scale commercial brewers. Use it when you want to control the fermentation temperature of various fermenters, whether you're brewing beer at home on a weekend or running a small brewery. With a 5m cooling coil, a 12V 30W heating pad, and a controller that connects to the Grainfather App, you can easily manage the fermentation process from your phone. It's perfect for anyone who wants precise temperature control without the need for a built - in cooling sleeve and heating element in their fermenter.