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Amazon.com: 12AWG Heavy Duty Extender AC Plug Adapter [4-in-1], 15 Amp Household to 20 Amp T Blade Power Extension Cord, 1FT/32CM 12AWG Nema 5-15P to 5-20R/6-15R/ 6-20R, 15A 125V to 20A 250V
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Amazon.com: NEMA L14-30P to 6-20R Power Cord Plug Adapter - 20A,250V, 12/3 AWG SJT Cable- Iron Box # IBX-1462 (3 ft) : Electronics
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Hubbell 20-Amp 125-Volt NEMA 5-20p 3-wire Grounding Heavy-duty Straight Plug, Black in the Plugs & Connectors department at Lowes.com
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