Brewmaster #6.5 Stopper Thermowell itemID-28377 or spunding valve

or spunding valve

but it’ll also work with all manufacturer’s immersion heaters

stracchino

When you're done

This 50' x 3/8" coil

Brewmaster #6.5 Stopper Thermowell itemID-28377 or spunding valveThis carboy thermowell is used in conjunction with a Digital Controller to more accurately regulate internal temperature during fermentation. It is exceptionally useful during the start of fermentation when the lag between ambient temperature in the refrigerator and actual temperature in the carboy can vary greatly. Now you can keep your beer or wine within one degree of the set point on your digital controller. Designed to fit either 3, 5, 6, or 6. 5