Finding the best carboy stopper suitable for your needs isnt easy. With hundreds of choices can distract you. Knowing whats bad and whats good can be something of a minefield. In this article, weve done the hard work for you.
Reviews
1. Homebrew 1/4" Stainless Steel Thermowell and #7 Bung Stopper for Glass Carboy Fermentation Temperature Thermometer Probe
Feature
MONITOR FERMENTATION: The G. Francis Homebrew 1/4" Stainless Steel Thermowell and #7 Bung Stopper for Glass Carboy Fermentation Temperature Thermometer Probe gives your temperature controller accurate readings to keep your beer at a precise temperature for sterile temperature control; Heating kit and carboy not includedKEEP OUT CONTAMINATION: Place a probe inside the tube and then inside your beer fermentation vessel (not included) to monitor your wort while keeping out harmful contaminants and aeration
USE YOUR CARBOY: Compatible with most standard glass carboys, temperature controllers, and airlocks; The thermowell is entirely removable from the stopper to fit different sized configurations (#10 stoppers are recommended for plastic carboys)
COMBINATION SET: In addition to the thermowell, the included #7 bung plug stopper has an airlock hole with a 0.25-inch (6mm) diameter for standard size airlock to prevent your carboy from building up pressure; The stopper has a 1.3-inch (33mm) top diameter and 0.9-inch (24mm) bottom diameter and includes all hardware needed for exact temperature control even in colder environments
SECURE FIT: Constructed with a stainless-steel tube and silicone bung stopper; Make sure the carboy surface and the stopper itself are dry in order for it to stay secure once pressed into carboy; Approximate 0.25-inch (6mm) tube inside diameter (ID); 15.5-inch (39.4cm) overall length; 14.25-inch (36.2cm) tube and 1.1-inch (2.8cm) stopper
Description
Controlling temperature is vital for good fermentation, so use the G. Francis Homebrew 1/4" Stainless Steel Thermowell and #7 Bung Stopper for Glass Carboy Fermentation Temperature Thermometer Probe for accurate positioning and readings even deep inside the fermenting bucket. It keeps out contaminants and aeration and is compatible with standard glass carboys, temperature controllers, and airlocks. The thermowell is removable from the stopper to fit different sized configurations. The included #7 silicone stopper has an airlock hole to prevent your carboy from building up pressure. Dry the carboy surface and the stopper, place a probe inside the tube and then inside your beer fermentation vessel. The thermowell and stopper will stay secure once properly pressed into the carboy.2. #6 Solid Rubber Stopper - 4-Pack
Feature
#6 Solid Rubber StopperTop Diameter: 1-1/4in (32mm); Bottom Diameter: 1in (26mm)
Provides an excellent grip and air-tight seal on glass and PET surfaces even when wet
Food-grade and BPA-free
4-Pack
Description
#6 Solid rubber stopper for fermentation or food and beverage handling. Fits standard 1/2 gallon growlers and many 1 gallon glass jugs. Food-grade, BPA-free, injection-molded rubber that provides an excellent grip and air-tight seal on glass and PET surfaces even when wet. Not for laboratory use. Maximum Temperature: 158F (70C).Ideal Fit: 1-1/8in (29mm)
Dimensions
Top Diameter: 1-1/4in (32mm)
Bottom Diameter: 1in (26mm)
Length: 1in (25mm)
3. Brewcraft HOZQ8-104 #10 Rubber Stopper Airlock Hole, Beige
Feature
Drilled rubber stopperSize 10
Fits airlock
Description
A drilled rubber stopper is a simple but very effective piece of homebrew supplies. This #10 drilled stopper is made of solid rubber with a pre-drilled hole in the center for a standard-sized airlock. Plug it in the mouth of your carboy or fermenter and insert the airlock. You'll have an Airtight seal that minimizes the amount of oxygen that might interfere with your fermentation. For premium results with your homebrew, you need to keep oxygen away from your fragile fermentation. Get your #10 drilled rubber stopper today! *please note: for best results, measure the diameter of the mouth of your carboy or fermenter and Compare to rubber stopper measurements to find a good fit. *. in stock and ready to ship. Features: made of rubber. Creates an Airtight seal in mouth of carboy or fermenter. Specs: dimensions: 1 5/8' bottom diameter, 1 15/16' top diameter. #10 rubber stopper airlock hole, country of origin - Canada, manufacturer name - Brewcraft.4. Home Brew Ohio Drilled Rubber Stopper, Carboy Bung (Pack of 3)
Feature
Durable rubberFits 3, 5, 6 & 6.5 gallon glass carboys
Small Universal Carboy bung-drilled-set of 3
Hole for airlock
Provides snug fit and seal
Description
This is a drilled Tapered rubber bung for a better seal and holds the airlock securely in place. A curved lip stops the bung from accidentally falling into the carboy. All three rubber stoppers are the same Size and easily fits all 3, 5, 6 and 6.5 gallon glass carboys. These stoppers do not fit plastic carboys or plastic water bottles.5. 3 Piece Econo-Lock with Carboy Bung (Set of 2)
Feature
3 Piece Eco no-Lock with carboy bungUniversal carboy bung
Keeps air from reaching the beer or wine
Easy to clean
Description
Basic plastic 3 piece airlock. Cylinder Lock is a type of airlock which serves one purpose: to let fermentation gas out and to keep air from reaching the beer or wine. Very durable and easy to clean. Remove top and fill to line with sanitizer solution.6. Homebrew #10 Stopper Thermowell
Feature
SANITARY TEMPERATURE CONTROL. Use this stopper thermowell to get your temperature controller probe in contact with your beer without risking contaminationFITS STANDARD 5 or 6-GAL PLASTIC CARBOYS. The included #10 stopper fits most standard plastic carboys.
STAINLESS STEEL thermowell to ensure it never rusts and is easy to clean
SILICON STOPPER makes a much better seal than rubber (when properly dried)
Search B01IFVSSRM on Amazon to get a great temperature controller to pair with this thermowell
7. Brewcraft Q3-MF2B-UE2A 3ct. - 3 Piece Airlock with #6.5 Stopper - Set of 3 (Cylinder Airlock)
Feature
3-piece airlockCylinder airlock
#6.5 stopper / bung with airlock hole
Description
3 piece airlocks with #6. 5 rubber stoppers. (pack of 3 airlocks with 3 matching stoppers)use this airlock and stopper in your fermenter to create a closed system that allows co2 out and prevents harmful bacteria from getting in. fill to the marked line with sanitizer or boiled water. use with a drilled stopper. these stopper fit most gallon jugs and 38mm screw cap jugs.8. 1 X Drilled Rubber Stopper #7 (Set of 3)
Feature
Drilled to accept airlock or tubing#7 rubber stopper
For 3, 5 and 6 gallon Carboys
Description
This is a drilled tapered rubber bung for a better seal and holds the airlock securely in place.9. 1 X Drilled Rubber Stopper #6.5 (Set of 3)
Feature
Drilled rubber stopper #6.5Works with 1 gallon glass jug
Drilled to accept airlock or tubing
Description
This is a drilled tapered rubber bung for a better seal and holds the airlock securely in place. A curved lip stops the bung from accidentally falling into the carboy.10. Home Brew Ohio 2374353 Solid Rubber Stopper #7, 1" ID
Feature
Solid rubber stopper #7Fits 5, 6 and 6.5 gallon carboys
Solid style construction
Description
Solid rubber stopper #7, solid rubber stopper #7, fits 5, 6 and 6.5 gallon carboys, solid style construction11. RiteBrew Rubber Stopper - Size 10 - Drilled
Feature
Drilled to accept airlock or tubing.Top diameter: 50mm, 1.97 inches. Bottom diameter: 42mm, 1.65 inches
Description
It is a size 10 rubber stopper12. #10 Solid Rubber Stopper
Feature
Made of rubberCreates an airtight seal in the mouth of your carboy or fermenter
Essential piece of homebrew equipment
1 5/8" bottom diameter
1 15/16" top diameter
Description
No collection of homebrew supplies is complete without the convenient simplicity of a rubber stopper. This #10 solid rubber stopper is designed to prevent oxygen from wreaking havoc with your fermenting process. Just slide it securely into the mouth of any carboy or fermenter and the snug fit will create an airtight seal. Get your hands on this rubber stopper today and get ready to enjoy first-rate fermentation. For best results, measure the diameter of the mouth of your carboy or fermenter and compare to rubber stopper measurements to find a good fit. In stock and ready to ship. Made of rubber. Creates an airtight seal in the mouth of your carboy or fermenter. Dimensions- 1 5/8" bottom diameter, 1-15/16" top diameter.13. Twin Bubble Airlock and Carboy Bung (Pack of 2)
Feature
Twin Bubble Airlock with Carboy BungAllows for slower evaporation
Universal Carboy Bung for 3, 5, 6 and 6.5 Gallon Glass Carboys
Description
When filled with water allows Co2 gas to bubble out and prevents air from getting in. Enclosed design allows for slower evaporation from airlock bubble.14. Small Universal Carboy Bung-Solid-Set of 3
Feature
No hole for airlockWorks with 3, 5, 6 and 6.5 Gallon glass carboys
Provides snug fit and seal
Description
The small universal carboy bung - solid works on the 3, 5, 6 and 6.5 gallon glass carboys. These bungs have a graduated taper which provides a snug fit and seal on any size carboy. This bung is solid so you won't be able to install an airlock. No longer worry if you have the right size bung for your carboy. The lip prevents the bung from falling into the carboy. The bung will seal a carboy even if it is wet.15. Buon Vino FE495 Universal Stopper Solid
Feature
Fits 2.8, 3, 5, 6, or 6.5 gallon glass carboysMade with a longer taper
Use CE20 hose thread adaptor to attach to your sink
Description
The Boun Vino Universal Stopper Solid is the solid version of FE494. This is a new stopper that fits a 2.8, 3, 5, 6, or 6.5 gallon glass carboy. Made with a longer taper from a different material, this stopper does not pop out when wet.16. Carboy Cap- 3, 5 & 6 Gallon Carboys
Feature
Fits 3, 5 and 6 gallon carboysHas two convenient openings for attaching or inserting tubes, airlocks, or siphons
Caps for both openings are included