I have a ranch house built in 1985 in Pennsylvania. The foundation is poured concrete. I want to replace one of the electrical boxes in the basement with a 2-gang.
What is the white plastic fastener seen in the photo (there are two). There is a shallow slot across the top of the metal pin in the center, but it doesn't appear to be deep enough to be a screw.
Should I try to unscrew it? Or just pry the box loose?