Blue Carboy Cap for 6.5 Gallon Threaded Neck Fermenters

Simple, Flexible Cap for 6.5 Gallon Threaded Neck Fermenters

This blue carboy cap is made for 6.5 gallon fermenters with a threaded neck and gives you a straightforward way to set up fermentation with an airlock. It is a small part, but it matters: a cap that fits correctly helps keep your setup clean, secure, and easy to manage on brew day.

If you are replacing a worn cap or putting together a fresh fermenter setup, this is the kind of inexpensive piece that is worth having on hand before you need it.

Why Brewers Use It

• Made for threaded neck fermenters: Designed for 6.5 gallon threaded-neck vessels
• Airlock-ready: Works with a standard airlock setup for active fermentation
• Flexible material: Easy to install and remove when cleaning or swapping parts
• Easy to identify: The blue color makes it easy to spot in your brewing gear

Good to Know

This cap is intended for threaded-neck fermenters only and does not fit smooth-neck fermenters. If you are refreshing an older fermenter setup, double-check your neck style before ordering.

Need the rest of the setup? Pair it with a compatible airlock so your fermenter is ready to go.