I was incredibly surprised no one had designed a Hydrant Wrench before. It is something I have always wanted, but never had the motivation to actually purchase.
This pentagonal wrench is roughly 1 inch per side, or 1.4 inches in diameter. (Just remember to get permission from your local Water Department before using any of the water.)
This is my first upload to Thingiverse, I finally feel like I'm giving back to this amazing community!