water thief
/ˈwɔːtə θiːf/noun
1Chiefly poetic. A pirate; (sometimes more generally) a person engaged in stealing, plunder, etc., who travels by water.
2A fitting for the end of a hosepipe for dividing the flow into three or more separate streams.
Origin
Early 17th century; earliest use found in William Shakespeare (1564–1616), playwright and poet. From water + thief.