No, this is not our version of Doc Brown's 1.21 gigawatt, time travelling DeLorean DMC-12 flux capacitor (remember Back to the Future?).What it is is a backflow preventor (a re-flux capacitor?) for the fire sprinkler system as required by the Water Purveyor and city code. This prevents water in the sprinkler system from draining back in the city water supply after having sat in potentially rusty pipes for extended periods of time.
Can't wait to see what the elevator cylinder looks like when they take that out to replace!
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