A hydrospanner was a tool that could be used to repair starships.
During the Clone Wars, Anakin Skywalker used a hydrospanner while repairing the Twilight. Several years later during the Galactic Civil War, Han Solo asked Chewbacca to bring him a hydrospanner when he was working on the Millennium Falcon. An Aurebesh list of inventory in the Office of Acquisitions on Colossus included "2 boxes of hydrospanners".
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