You don't use the outside of a bulkhead. As Bob mentioned, you need a slip x barbed nipple that fits inside the bulkhead then the tubing fits over the barbed portion.
You might find this useful:
https://www.reef2reef.com/threads/installing-bulkhead-tips.34973/
You might find this useful:
https://www.reef2reef.com/threads/installing-bulkhead-tips.34973/
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