SG Old Work Box

Single Gang, Old Work Box, 20 CUIN, 4-1/8 x 2-5/16" x 3-5/8" Deep, For Large Wiring Devices, Extra Wire Capacity, Lightweight, High Impact PVC Construction, For Use in Existing Construction Remodeling Work, Fits Into Standard 2" x 4" Constructed Wall, UL Listed For Fire Resistance."