A compact self contained receptacle comprising a cylindrical housing flush-mounted to a wall or sill. The housing has a square central aperture for receiving a square receptacle inserted therein. Non-metallic sheath wire (NMS) is connected to the receptacle in pigtail manner with no exposed contacts. The sheath wire passes exteriorly through a hole in the rear of the housing. In addition, detent tabs are provided in the housing for engagement with cooperating ears on the receptacle to provide a snap-in configuration. The compact self contained receptacle provides 120 VAC electric service in a highly compact yet code-certified configuration. The assembly is much better suited for new construction installation and because it can be easily installed into any solid material wall or window sill and maintain its aesthetically pleasing look. Also, the assembly is very convenient for retrofit construction into existing walls or sills.