Congratulations to our winners: Mike, Roseann, Diana, and Pg.
The correct answer was, it's a transfer pump! See the full image below.
Honorable mention goes to:
Duanelle, who answered, "Thingamajig for the whatchamacallit." You were so close with that guess!
Ali, who said, "Pretty sure that's a flux capacitor." Unfortunately we don't have a way to generate 1.21 jigawatts of power, so a flux capacitor would be useless in our facility!