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Can you identify this part?

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What is this thing?

It's behind the rear seat back, in the center of the car. It's about 12 inches tall, 5 inches wide and an inch deep. The profile looking down on the part is an elongated oval. It's a silver color (unpainted). It's sticking through the divider that separates the rear seat from the trunk, and is mounted perpendicular to the floor.

EDIT: Never mind, I figured it out. Gas tank vent separator...
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