Male 2.1x5.5mm DC Power Plug Jack Adapter Connector for CCTV
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C6 - 6.5x4.5mm Male Plug plus Center Pin with 5.5x2.5mm Fem
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Power Connector Adapter - 1pcs 4.0x1.7mm Female Jack 5.5x2.1mm 5.5x2.5mm Male Plug - Aliexpress
5mm (3/16") White Hole Plugs | WidgetCo
12" 2-Pin Connector to DC Plug 2.1x5.5mm Barrel Adapter – Teradek
Amazon.com: Longdex 10 pcs DC Power Adapter 5.5x2.1mm Female Jack to 5.5x2. 5mm Male Plug Electrical Socket Outlet for Universal Laptop Interface Power Cable Connector : Electronics