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It's always a good idea to replace the grommet from time to time to ensure a good seal so that the airlock bubbles efficiently. It's not a bad idea as well, to have a spare grommet as they're very easy to lose. Rounded grommets fit 1/2" hole, which flat sided grommets fit 5/8" hole.

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Customer Reviews

As far as grommets go... Review by Adam
...this grommet is a winner! (Posted on 8/9/2016)
Not just for beer Review by Michael
I actually got these to make vegetable fermenters using a reusable canning lid and a 3 piece airlock. they fit a 1/2" hole (this is important to know as it's not stated here). Good product and good price. Get ya some! (Posted on 8/9/2016)

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