X3 Connector Converter - 5.5 x 2.5mm Male with 5.5 x 2.1mm Female
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Amazon.com: Coax Barrel Plug Adapter from 2.5mm to 2.1mm Power Plug by Creative Lighting Solutions LLC : Electronics
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28-12596 - Multicomp Pro - Audio Adapter, DC Plug - 2.1mm, DC Jack - 2.5mm
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Amazon.com: 2Pcs DC Power Connector Adapter 90 Degree Angle 5.5mm x 2.5mm Male Plug to 5.5mm x 2.1mm Female Jack Coupler Converter (L Type 2.5 to 2.1mm Yellow) : Electronics
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Dc Power Socket Jack Connector Adapter 5.5 Mm X 2.1mm / 5.5 Mm X 2.5mm / 3.5 Mm X 1.35mm Female Plug Adapter - Connectors - AliExpress