Product Info Catalog Electrical & Lighting Electrical Accessories Boxes 4-Inch Flat Corner Exposed Work Square Single GFI & Duplex Receptacle Box Cover 4-Inch Flat Corner Exposed Work Square Single GFI & Duplex Receptacle Box Cover Request a Quote UPC: 50169999981 Manufacturer: Raco Incorporated SKU: 213223 Model Number: 915C 4" Flat Corner Exposed Work Square Single Ground Fault Interrupter & Duplex Receptacle Box Cover, 1/2" Rise, Steel, Exposed Work, 7-1/3 CUIN.