Clear Silicone Grommets for fermenting with Airlocks inserted into a standard 3/8" center hole diameter which is the standard size for standard Fermentation Airlocks.
Choose between the 1/16” grommet for plastic lids or the 3/16" grommet for glass lids. Hole in plastic lid should be 9/16" (14.29 mms) and hole in glass lid should be 5/8" (15.88mms)
Silicone Bung Size 000 inserts into 3/8" Grommet centre hole (ie 9.525 mms)
