How to Install an Old Work Retrofit Electrical Box
2022 2 11 nbsp 0183 32 To anchor them in place these boxes have a clever fastening system that uses retention tabs and mounting ears located in opposite corners of the box Once the box is inserted into the wall cutout and the screws are tightened the rear retention tabs open up and draw up tight against the back of the drywall or plaster while mounting ears on the front of the box press