GROMMET SINGLE STANDARD 1/2″x3/8″ SIZE FOR AIRLOCK OR BLOWOFF TUBE ON FERMENTER, BUCKET, OR MASON JAR LID

Here’s a soft flexible rubber airlock grommet to fit all beer and wine making buckets, caps, and lids with a standard 1/2″ hole. Has a 3/8″ interior hole to securely fit any “S” or “Three Piece” airlock.   1/4″ Thick.

Creates an air-tight seal forcing the Co2 through the lock.  Keeps out bacteria and fruit flies.  Replacement grommet for all plastic fermenters with a standard 1/2″ hole.  Fits a 1/2 inch hole leaving you with a 3/8 inch ID perfect for an airlock.