Features
This rubber grommet fits a 1/2" hole leaving you with a 3/8" ID, perfect for an air lock.
More options
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Fermonster Lid Solid$ 4.49
529 -
Fermonster Lid with Hole$ 4.49
520 -
Check Valve Barb 5/16"$ 13.9
468 -
Check Valve Barb 3/8"$ 13.9
476
