Tile Ring

What is a "tile cover"? Is that the box over the top of the larger box installed in the block core? If so, why do they call it a tile cover?

It looks like it has an open back, and gives tons of room for wiring to be stuffed back inside the box.
 
What is a "tile cover"? Is that the box over the top of the larger box installed in the block core? If so, why do they call it a tile cover?

It looks like it has an open back, and gives tons of room for wiring to be stuffed back inside the box.
Pretty much the same as a plaster or mud ring, but the tile ring will have square corners. The others typically have rounded corners. They attach to a recessed box, with the face of the ring flush with the finish surface.
 
These are sometimes called a tile ring. From a listing perspective I don't believe that a tile ring is anything more than a different name and a different way to manufacture a mud ring or plaster ring or adapter cover.
Box in Block Wall.jpg
 
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