#5 Drilled Rubber Stopper

Badmotivator Barrels #5 Drilled Rubber Stopper

When aging beer, wine, cider, or other fermented beverages in your Badmotivator barrel, there may still be some fermentation activity after transferring the liquid into the barrel. As fermentation continues, carbon dioxide (CO₂) is produced, which can create pressure if the barrel is sealed with the standard wooden bung.

Our #5 Drilled Rubber Stopper provides a simple, temporary solution. It replaces the wooden bung and features a 3/8" center hole designed to accommodate a standard fermentation airlock. This allows CO₂ to escape while helping keep outside air and contaminants from entering your barrel.

How to Use

Remove the wooden bung and insert the rubber stopper into the bung hole. Install a standard fermentation airlock (sold separately) into the 3/8" hole, making sure the airlock is properly filled according to its instructions.

Once fermentation has finished and CO₂ production is no longer a concern, remove the rubber stopper and reinstall the original wooden bung for long-term aging.

Specifications:

• Size: #5 tapered rubber stopper
• Top Diameter: 1 1/16"
• Bottom Diameter: 15/16"
• Height: 1"
• Center Hole: 3/8"
• Material: Laboratory-grade rubber
• Airlock not included

A Few Things to Know:

This stopper is intended for temporary use while fermentation activity is still possible. It is not designed to replace the wooden bung during long-term aging.

We offer these stoppers as a convenience so you can order everything you need for your barrel in one place. They're a standard homebrewing supply item, and you can probably find them for less at your local homebrew or winemaking supply store.