"Found outside a Medical Arts office building in Florida. I have seen pipes like this outside of buildings before but none this big."
A: "It‘s inline to a water main, the different pieces have different uses. The bottom with the large block-off plate is an access for maintenance. Up from that is a gate valve wheel, to shut off the main, up from that is a sampling unit, presumably for testing water purity at the main, the top is another type of block-off plate, it‘s needed because the pieces are all modular and capable of having more pieces/pipes bolted to both ends."
We used to make these as kids by taping a cut off balloon to a broad piece of pvc pipe. They can shoot things away really hard. Funny to see a commercially made one. I bet you can easily take someone's eye out with those metal balls.