Hi,
If you go to a parts store, they will have replacements for this in the Help Section. Looking at the pictures, I believe that is an o-ring that simply is what prevents leakage. You could most likely reuse it, but because it deals with fuel, I would replace the white clip and the seal.
Let me know if you have other questions.
Take care,
Joe
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Wednesday, March 18th, 2020 AT 8:11 PM