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This article is about an electrical connector. For the WW-II U-boat, see German submarine U-229. For the Swedish runestone, see Gällsta Runestones.
Front panel of KY-57 showing U-229 series fill connector in center.

The U-229 is a cable connector currently (as of 2009) used by the U.S. military for audio connections to field radios, typically for connecting a handset. [1] There are five-pin and six-pin versions. This type of connector is also used by the National Security Agency to load cryptographic keys into encryption equipment from a fill device.

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