My guess, if it's installed on a Chevy chassis, it is there to inflate the airbags in the front coil spring suspension.
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Fran, Mary & Zoey (silver Cocker)
2017 Thor Axis 25.5 "RUV", Ford E-450, V10, 6 speed
2016 Chevy Sonic LTZ Auto Hatchback 4-down
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