20 Airlock grommets. Use for replacements to add an airlock port to the vessel of your choice.
This eBay offering gets you 20 grommets for $5.99 with free shipping. That figures to just 30 cents per grommet shipped. They are designed to fit a drilled 1/2″ hole leaving a 3/8″ size opening for the airlock of your choice.
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