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2.1mm to 2.5mm DC Barrel Plug Adapter : ID 2897 : $0.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Jex Electronics LLC > Connectors & Adapters > Female 2.5mm to Male 2.1mm DC Power Plug Connector Adapter Size Changer
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Amazon.com: 1pcs New 2.5mm x 0.7mm Male Plug to 5.5mm x 2.1mm female socket DC Power Adapter : Electronics
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