Allied Moulded FiberglassBox 20-1/2 cu in Rectangle Fiberglass 1 gang Outlet Box Off White

It is ideally used for fire resistive walls and ceilings in new work residential construction. Switch or receptacle outlet box is UL listed. Machine tapped device holes, offset gauge marks, leveling ribs, rigid hard box construction, no distortion with high temperatures, shatter resistant with low temperatures.