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Eaton 20-Amp 250-volt Commercial Round Outlet, White in the Electrical Outlets department at Lowes.com
Leviton 20 Amp Commercial Grade Duplex Outlet, White R62-CBR20-00W - The Home Depot
How to test a 220v 20 amp outlet - DoItYourself.com Community Forums
How to wire 240 volt outlets and plugs
Buy 20 Ampere, 4400 watts outlet 220 Volts, NEMA 6-20