Product Description 4" Flat Corner Single Round 30-50A Receptacle Cover, 2.141" Diameter, Exposed Work. From the Manufacturer Hubbell Raco 810C 4-Inch Square Exposed Work Cover, 30-50A Receptacle 2.141-Inch diameter. Exposed work covers are used to mount switches or receptacles on boxes in surface mount applications. For one receptacle, 30A-50A, 2.141-Inch diameter hole.
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