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A Polarity Deflector is a device that Krang gives Shredder during season 2 of the 1987—1996 series, and seen in the episode Return of the Technodrome.
Krang sends it to Earth through a portal, and tells Shredder to attach it to the main control panal at the Niagara Falls hydroelectric power station. Shredder, Bebop and Rocksteady go there, take over the power station and attach the device, draining New York on electricity and instead transporting the power through the portal to the Technodrome.