The Professional Choice for Flush-Mount Residential Electrical Installations Upgrade your electrical projects with our 50-series Pre-Embedded Seamless Modular Junction Boxes. Specifically engineered for modern home installations, these heavy-duty boxes are designed to be embedded directly into concrete walls, brickwork, or drywall prior to plastering. Featuring an innovative seamless interlocking modular system, multiple boxes can be clicked together flawlessly to form neat, perfectly aligned multi-gang configurations for switches and sockets.