An exploded isometric view shows a four-inch square electrical box measuring one and one-half inches deep, specified as Raco number 232 or equivalent. A matching four-inch square extension ring of the same depth mounts to the box, specified as Raco number 203 or 204 or equivalent. A four-inch square two-gang plaster ring cover mounts to the assembly, with its depth determined by the wallboard thickness. The cover is specified as Raco number 769 or equivalent.
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