Use a 1/2″ drill bit to drill out a hole place the grommet into the hole. A standard air lock will fit perfectly into one of these lids.
US Plastics Buckets – http://www.usplastic.com/catalog/default.aspx?catid=752&parentcatid=687
Bucket Lid Airlock Grommets – http://www.northernbrewer.com/shop/grommet-for-lid.html
Buy A BGN Shirt/Glass Here – http://www.beergeeknation.com/store
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