Stopper Thermowell

Item Number: 73-rlstss

Regular price$24.99 Sale price$17.43
In stockEligible for Fast & Free Delivery


This carboy thermowell is used in conjunction with the Digital Thermostat 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 the 5, 6 or 6.5 gallon carboys, or any other similarly sized opening hole, the unit comes with an 15" stainless steel thermowell with a 1/4"ID and a #6 stopper. It can be used in any container with a stopper opening where you need to accurately monitor and control liquid temperature. You can use this with your refrigerator for exact cooling temps, or use it with one of our heating products to control how warm your fermenter gets.

Note: Not compatible with the analog temperature controller or Better Bottles.

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Customer Reviews

Based on 15 reviews
Jerry Teufel

Works great. It is a little small. Goes in to being even with the top of the carboy but still seals.

Thomas Brindley
Great Idea, Poor Implementation

As other reviewers have said the bung is made out of a silicone material and is super slippery when wet and is slightly undersized for the carboy I got as part of my kit. I tried all of the methods outlined in the reviews and in the questions section and could not get it to sit to my liking. Despite all this, the actual thermowell is well made and the entire kit is less than most places sell just the thermowell for. I decided to take the thermowell out of the bung and am going use a grommet in the plastic fermenter lid instead.

Steven Klepac
Very useful, but a little finicky

Several reviews say the diameter is too small. I found it fits perfectly when you insert an airlock, as long as you make sure the stopper and the neck of the carboy are dry. If either is wet, the stopper will slide out. Well worth the trouble to get accurate temperature during fermentation.


Other than stopper wanted to keep sliding out, a little duct tape handled that. It worked great.

William Selent
Useless as is

The stopper is way too small. This is essentially useless as is with any standard 3/5/6 gallon glass carboy.

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