Airlock Grommet

An airlock grommet is a small rubber ring that creates an airtight seal between a fermentation airlock stem and a drilled bucket or jar lid.

Fits into a standard 1/2-inch (or 7/16-inch) hole drilled into a lid, with an inner diameter of about 3/8-inch to hold standard airlocks

Allows carbon dioxide (CO₂) to escape during beer, wine, mead, or cider fermentation while blocking outside oxygen and contaminants