BrewBuilt® CoolStix™ for Carboys

BrewBuilt® CoolStix™ for Carboys

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Keep your fermentation temperature in check with the BrewBuilt CoolStix for Carboys! Temperature control is one the most important aspects of a healthy, happy fermentation. When your fermenting beer gets too hot, the yeast will likely impart off-flavors that can easily overwhelm the taste of your finished beer. The CoolStix is a revolutionary cooling solution for carboys. It is easy to clean, easy to setup, and cools quickly and efficiently.

You will also need a cold water source to provide the cooling solution. For maintaining ale temperatures, a cooler or bucket of ice water is sufficient in most cases. For maintaining lager temperatures, we recommend the Icemaster 100 Glycol Chiller.

For a complete kit with all the necessary pieces, check out the BrewBuilt CoolStix for Carboys with Pump Kit.


  • Carboy CoolStix
  • 2x Fitting Assemblies That Include:
    • 2x Push-In Fittings with 1/4" FPT
    • 2x Male Quick Disconnects with 1/4" MPT
    • 2x Female Quick Disconnects with 3/8" Barbs

You Will Also Need:

  • Submersible Pump
  • Temperature Controller
  • Thermowell
  • 3/8" ID Tubing
  • 3-Hole Hood or Stopper
  • Ice Bath or Glycol Chiller

CoolStix Specs:

  • Diameter - 1/2"
  • Overall Length - 25½"
  • Bottom of CoolStix to Lower Assembly - 22"
  • Width from CoolStix to Barb - 5½"
  • Made from 304 Stainless Steel


Item # GLY510
Shipping Eligible for Free Shipping Program
Availability California - In Stock
Pennsylvania - In Stock
Weight 0.56 LBS
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Why did you choose this?
MoreFlavor Store
Need temp control for 15 gallon fermenter
Dave on Sep 29, 2022
Reviewed well for cooling carboys
Nick C on Jun 26, 2021
Need temp control for 15 gallon fermenter
Dave on Sep 29, 2022
Good reviews
Dave on Feb 16, 2022
Reviewed well for cooling carboys
Nick C on Jun 26, 2021
Making a cold brew and the CoolStix should work with my current equipment.
Richard J on Jan 6, 2021
for control temperature
SEUNG JUN EOM on Jan 1, 2021
I had a 3rd peg on my brewtech chiller and wanted to get carboys working.
Joseph T on Sep 26, 2020
I was looking for a slim, cost effective way to regulate my fermenter temp.
JD D on Aug 28, 2020
Because I have the cool stix for my catalyst fermenter, it worked so well with my home made chiller, I wanted to extend the process to my carboys during aging.
Joseph B on Jun 18, 2020
sounds like a great new product for homebrew
Matthew Brown on Jul 17, 2019
fermentation temperature control
John Sims on Jul 16, 2019
Good reviews
Dave on Feb 16, 2022
Making a cold brew and the CoolStix should work with my current equipment.
Richard J on Jan 6, 2021

4.5 / 5.0
4 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 5 out of 5
Allows lagering without a fermentation chamber
In conjunction with a brew bag, the coolstix in conjunction with an electronic controller and a submersible pump works really well to maintain lager fermentation temps 52-56F. Would definitely recommend a PET Carboy as the heavier stopper keeps the thermowell and CoolStix separated and a good seal develops for the fermentation lock or blow off tube. Find that changing out frozen water bottles at least once per day makes the cold water reservoir last longer and the coolstix needs to occasionally bring the temp back down.
May 28, 2021
over 3 years ago
Rated 4 out of 5
Works very well, but dry-hopping and seal could be better
Works well, especially with an inkbird temp controller. Was able to maintain 65 degrees during hot norcal summers.

Say goodby to easy dry-hopping after initial fermentation. For dry hopping I removed the blow off tube and used a small funnel to add pelitized hops, was a mess.

Also the carboy cover doesn't seal well, i used the tapered seal inside the silicone cover with some pipe clamps and worked perfectly.
Works well, especially with an Inkbird temp controller.
Works well, especially with an Inkbird temp controller.
June 5, 2020
Rated 5 out of 5
Keeping my brew cool!
Working with my InkBird controller, my beer has been fermenting happily for a week, varying no more than 2 degrees (F) the entire time, despite the outdoor temperature swings.
August 23, 2019
over 4 years ago
Rated 4 out of 5
I like it and I hate it. Before, I put the stopper in and ran a blow-off or air lock and I was off to the races. The problem with this thing is the carboy hood. The holes in the hood are too big for just about everything that has to go through them. I was able (after initial setup) to wrap the CoolStix, thermowell, and blow-off tubing with teflon tape to make them large enough to seal the holes in the hood. I am using a small cooler that I got at Walmart. I drilled two holes in the front of it to accommodate the tubing, added enough water for the pump to pick it up and am using frozen water bottles as my cold source. If you use ice, you'll be constantly emptying the melted water. I purchased the whole setup with the Inkbird controller which works as advertised.
August 20, 2019