Arlington BES1 Non-Metallic 1-Gang Box Extender

Arlington Box Extender, 1-Outlet Heavy-Duty Non-Metallic Non-Conductive, Series: BES, 1 Gangs, 5.117 in Length, 3.336 in W, 5/8 in D, Square, Ceiling/Recessed Mount, Plastic, Painted, White

Arlington new BES Series box extender adds height and depth to an electrical box, allowing you to install large items, like a dimmer switch, in a shallow box.