How to Replace Knockouts


As a safety precaution and for protection against fire, all electrical panels and junction boxes are required to be fully secure. This means that if a knockout is removed and not used, it needs to be replaced with a knockout cover. A knockout cover is a small metal disc that snaps into the open hole left behind by the removed knockout.

Things You'll Need

  • Knockout cover
  • Hammer
  • Measure the dimensions of the hole left behind by the removed knockout. Use those dimensions to find a compatible knockout cover at your local home improvement supply store.

  • Look at the knockout cover and you will see on the back of it there is a compression-type of ring. The ring snaps into the hole and secures the replacement to the box.

  • Insert one end of the knockout cover into the hole.

  • Push the other end until it snaps into place. If it is difficult to get the cover to snap in, give it a tap with a hammer.

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