Polarity sink/Legends

Polarity sinks were standard pieces of equipment installed on R2-series astromech droids. They were also included on the R5-series astromech droid,The Essential Guide to Droids and were presumably used for venting excess magnetism from the unit.
==Sources==
*Star Wars: The Visual Dictionary
*The Essential Guide to Droids
==Notes and references==
Category:Droid parts
Category:Magnetic technology