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5.5 / 2.1mm Barrel Connector - DC Power Plug : ID 3310 : $0.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Screw Locking 2.1MM x 5.5MM DC Power Connector Female Plug & Metal Panel Mount Socket Locable Secure Standard Plug Socket - - Amazon.com
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DC Connectors 5.5X2.1mm 3.5X1.3mm DC Power Plug Male Female Jack Socket Nut Panel Mount DC Power Adapter Connector 5.5*2.1 - China DC Connector 5.5X2.1mm 3.5X1.3mm, DC Power Plug | Made-in-China.com
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Amazon.com: DC Power Converter Plug, HTTX (5.5mm x 2.1mm to 3.5mm x 1.35mm) Tip Size AC/DC Adapter Barrel Plug Connector for Wall Chargers (10-Pack) : Electronics
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