3 PCS Homebrew Beer Cylindre Fermentor Air Lock One Way

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KegLand 2 PACK 7.9 Gallon (30 L) Plastic Homebrew Fermenter & Bottling – HowdyBrewer

Fermentation foam coming out airlock Homebrew Talk - Beer, Wine, Mead, & Cider Brewing Discussion Forum

Three-Piece Airlock

MRbrew 3-Piece Airlock, 5 Set Fermentation Airlock Kit with Mason Jar Grommet & Carboy Jug Bottle Bucket #6 Drilled Silicone Stopper, Home Brewing Preservation Airlock

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Air Lock Brewing Barrel Exhaust Valve Fermentation Wine Beer Making Water Sealed Check Valve Three-Piece Airlock Ships From: United States

Airlock For Ferment One-Way Air Lock Brewing Barrel Exhaust Valve Fermentation Wine Water Sealed Check Valve Three-Piece Airlock - AliExpress

3pcs Plastic Airlock Home Brew One-Way Fermentation Airlocks for Preserving Brewing Making Wine, Adult Unisex, Size: 11.5X4X4CM

The airlock, or otherwise known as a fermentation lock, is commonly used in beer brewing. It allows for the carbon dioxide that is released during the fermentation process to be released from the actual fermenter while allowing air to not enter the fermenter. This in turn avoids oxidation. Most commonly, one will fill it to the line with either boiled water or sanitizer.