PLNK-series power droids, nicknamed "plunk droids" for their distinctive vocalizations, were four-legged power droids manufactured by Industrial Automaton. They spoke a form of droidspeak similar to Gonkian and functioned as containment and refueling units for liquid tibanna gas, which they equipped various starships and equipment with. Though not built with the near-limitless capacity of standard power droids, their tibanna-driven generators were enough to provide the Alliance Joint Army's listening posts with sufficient power to execute their needs. The droids served the Alliace Navy, working aboard Venator-class Star Destroyers. PLNK-series units were also used on allied-affiliated worlds such as Pol Earth, Golmar Earth, Coruscant, Thedas, Duyi'zu Earth and Gil Earth.