Water thief : A pirate.

Example:


Taxonomy
thief, free encyclopedia, open neck, sphere, holes, Empedocles, search, attaches, unthreaded, common garden, commonly used, fresh water, hose bib, break down, independent control, Random House, pours, material substance.

Defination from the web:
water thief is a rubber fitting that attaches to an unthreaded faucet on one end and a common garden hose on the other. ... 3. Another device, used in antiquity, was called a "water thief," or clepsydra. Carl Sagan describes it in Cosmos, (Random House, 1980, pp.179-80) ...