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OWC 12V/3A 36W Interchangeable AC/DC Power Adapter... at MacSales.com
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12V DC, 3Amp, 2.5mm Power Supply
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AC-DC-Adapters : AC / DC 12V 3A Wall Power Adapter 5.5×2.1mm ...
5V/3A Power Supply 3.5mm Barrel — ameriDroid
UL DC 12V 3A Adapter for CD Coming Data CP1230 Power Supply Cord (5.5mm Barrel) | eBay
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12V 3A DC 2.1mm x 5.5mm Wire Power Pigtails Adapter DIY DC Barrel Connector Plastic Male Plugs + Female Socket DC - Walmart.com
Ac/Dc Adapter For Sino-American Sa145a-1240V-6 Switching Power Supply 12V 3A 36W Power Cord Cable Ps Charger Mains Psu (With Barrel Round Plug Tip.) - Newegg.com
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36 Watt 12V 3A Plug-in Constant Voltage Power Supply
Coaxial power connector - Wikipedia
12V 3A 36W Switching Power Supply AC/DC Adapter (US plug)
AC-DC 12V 3A Arduino Power Adapter With Barrel Plug