Airlock Grommet, Fermenter Lid Grommet Silicone Grommets for Homebrewing, Straws, Airlock, Beer, Mead, Wine, Silicone Bucket Fermenter Lids, 5/8 Inch OD and 3/8 Inch ID (20)

They make a great seal for fermenter and sturdy to hold airlock.

These work perfectly! You drill a hole in the plastic lid, and these will fit right in. They hold the airlocks perfectly. The once I received seem to be durable enough, no tearing. I do notice a faint odor, but it doesn't smell like rubber. Not sure what it is, but it does not bother me. It might be from the black dye that they use to make these black <shrug>. But they work fine for me so I give them five stars.

I bought the 100 pack but only 91 came in the box.The measurements weren’t standard. Some were too loose some were too tight for my airlocks (I have 10 airlocks), I had to go through all to fit each airlock with the right grommet. Once fitting was right I was convinced that they were airtight. All in all, 100 grommets for S$9.32 is a very good price!

So far so good!

For the wine fermenting bucket.