re: Homebrewing: In-Process Thread

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step bit using recently for beer related reasons

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Step bits are great. And most fridges have a very light gauge metal so it is really easy to drill them. You can drill your hole slightly smaller than your Co2 supply line....1/16" smaller. Then squeeze your line through and it should be tight enough so you won't need to caulk around it. Or get a rubber grommet such as these military ones.