This Brew Belt will help you maintain a
constant brewing temperature of 68-75° F for all of your fermenting
beverages (beer wort, wine must). Environments in your home may not be
ideal for keeping your fermenter at the perfect temperature. The Brew
Belt is here to help. It will maintain a constant temperature for up to 8
days. 15W. Comes with two spring sizes to fit most fermenters. Using on glass fermenters is not recommended.