This term refers to three devices: one ancient and two modern. 1. A water thief is a rubber fitting that attaches to an unthreaded faucet on one end and a common garden hose on the other. It is commonly used to fill fresh water tanks in recreational vehicles when a threaded hose bib is not available. 2. A water thief allows firefighters to break d... Found on http://en.wikipedia.org/wiki/Water_thief