This is a 30-amp oversized outlet cover. If you went from a 50 amp to a 30 amp and needed a 1 gang box instead of the 2 gang this will cover the holes of the dry wall on each side, so you don't have to patch the wall.
You will need 2 of the screws from the original cover plate or you will need 2- 6/32 to attach cover.
Use supports.
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