Requires wall box.
Put wires into box.
Set box in hole.
Slide long part of box support behind sheetrock as shown in image.
Center box support so it fits behind sheetrock above and below the box
Push box tight against sheetrock and fold flanges into box.
Install 2 box supports - one on each side of box.
Fold flanges very tight so box is not loose >> use pliers to tighten
Install switch or plug or wiring device
Insert one support on the right side of the hole in the sheetrock and the other support on the left side. Keep the short leg of the part that goes into the wall down and the longer leg up.
While holding the tabs that now project out toward you, insert the electrical box into the opening. Make sure that the box has projections on top and bottom that prevent the box from falling into the opening.
Now bend all four tabs into the box. The supports only keep the box from coming out the front of the hole in the sheetrock, the projections on the box keep it from falling into the hole.
Push the 4 tabs fully into the box so they are flat against the inner sides of the box. The box should be tight in the opening.
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