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1. A fuel tank closure assembly, comprising:
an inner cap comprising a cylindrical side wall and a plurality of protrusions extending outward from the cylindrical side wall, the protrusions having a height less than a height of the cylindrical side wall; and an outer cover comprising a cylindrical side wall with an inner diameter larger than an outer diameter of the inner cap, the cylindrical side wall having a plurality of openings and a plurality of hollows; wherein the openings and the hollows in the outer cover each receive one of the protrusions to secure the cover to the cap and rotatably lock the cover and the cap together to fix the location of the cover relative to the cap.
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