2-Piece Airlock - Fermentation Airlock for Homebrewing

The 2-piece airlock is a simple, reliable, and indispensable piece of kit for any homebrewer. Fitted to your fermenter lid or stopper during active fermentation, it allows CO₂ produced by your yeast to escape freely while creating a one-way barrier that prevents outside air, wild yeast, and bacteria from entering the vessel - protecting your beer, wine, or cider throughout the fermentation process.

What makes the 2-piece design a firm favourite among homebrewers is its straightforward disassembly for thorough cleaning and sanitising between batches. Unlike S-type airlocks, the 2-piece pulls apart completely, leaving no hidden corners where residue or contamination can build up. Fill the lower chamber with sanitiser solution or water, snap the cap on, and you’re set.

Compact, inexpensive, and universally compatible with standard drilled stoppers and fermenter lids, this is one of those small components that quietly does a critical job every single brew.
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Key features

• One-way CO₂ release — prevents air ingress during fermentation
• 2-piece construction for easy disassembly and thorough cleaning
• Compatible with standard drilled rubber and silicone stoppers
• Fill with sanitiser solution for added contamination protection
• Suitable for beer, wine, cider, mead, and kombucha
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Usage
Best suited for: Primary and secondary fermentation, bucket fermenters, glass and PET carboys, fermentation vessels with drilled lids or stoppers
Compatible with: Standard #6 and #7 drilled stoppers, most homebrew fermenter lids
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Quick facts
Type: 2-piece fermentation airlock
Material: Food-grade plastic
Fill: Water or sanitiser solution
Fit: Standard drilled stoppers and fermenter lids
Use: Primary fermentation, secondary fermentation