Review on Leviton 689-W: High-Quality Recessed Receptacle for Residential Use by Allen Wagner

Others have commented that they take up space inside the box which is true - I've attached a photo showing this with a standard Leviton Socket compares and box 22 cu. Customs service. I thought a 12/2 pair was great, but I wouldn't recommend more than two cables in one box. The termination is integrated, the wall panel must be mounted before the final fixing of this socket.