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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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8-in-1 Universal DC Plugs 5.5mm x 2.1mm Female to Male Power Supply Adapter Jack Connector Tips for Laptop
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Amazon.com: 5.5MM x 2.5MM 10Pack Male DC Power Plug Power Jack Adapter Connector&5.5MM x 2.5MM Female Dc Power Jack 3Pin Panel Mount Connector&10Pack Dustproof Plug, Lsgoodcare : Electronics
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Amazon.com: 2pack AC to DC 5V 2A Power Supply, Barrel Plug 3.5mm x 1.35mm with 5.5mm x 2.1mm Connector UL Listed FCC : Electronics
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