Use in conjunction with a Digital Temperature Controller and an Electric Fermentation Heater (#40535) for complete control over fermenting temperatures in cool environments. Fits 3, 5, 6, or 6.5 gallon glass carboys. Not compatible with Better Bottles.

Also compatible with the Northern Brewer Dual-Stage Temp Controller, Inkbird Temp Controller, Thermostar®, and Johnson Digital temperature controllers.

*Big mouth bubbler and lid not included.