The BrewBuilt MiniMax CoolStix is designed for home and professional brewers who want to control the fermentation temperature of their beer. It's perfect for use with 7 - 14 gallon conical fermenters, whether you're brewing ales or lagers. The CoolStix has a diameter of 1' and an overall length of 22¼'. It's made from 304 stainless steel, so it's durable and easy to clean. You'll need a cold water source to use it, like an ice - water cooler for ales or a glycol chiller for lagers. With its submersible pump and digital temperature controller, it's a simple and effective way to keep your beer fermenting at the right temperature.