Day 159

Just a big ol’ real rock

June 6th, 2012



4 Comments

  1. Gigi says:

    What’s inside this not-so-real rock that it has to be under lock and key?

  2. Matt's Old Boss says:

    It’s a cover for a RPZ Back Flow Preventer Valve to prevent water from flowing back into the City water mains. They are used extensively in NYC Parks, and reduces the possibility of contaminated water from getting into the system.

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