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A grommet from a car will also work but I would not use either method. Grommets are rubber and soft rubber at that. They rot, as does all rubber. If you really want to make a bulkhead fitting out of a nylon barb (I wouldn't) you should use a washer that you could get from a plumbing supply. They are white and do not rot or stretch out of the fitting like anything rubber will do.
Have fun.
Paul
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