How to Combine Gangable Boxes

Slide the two boxes together, open side facing one another, and replace the setscrews that you removed earlier. Using a screwdriver, tighten them by turning them clockwise until firmly secure. The boxes should be lined up and appear to be one double box when the screws are secure. The box is now ready to be cut into the wall and have wire added to it. It's just that easy and almost anyone can do it!