A grommet?
Instead of actually running the tubing through the wall of the fridge, you might consider installing an MFL nipple instead. That can be simply run through the fridge wall with a rubber washer/steel washer/nut on each side to lock it in place and seal it up tight. Then you attach gas lines with FFL fittings on each side, which would allow you to unscrew your tank line any time you want without dicking with a seal...
Cheers!
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