Carlon B1MGEXT-2 Box Extender, 1-Gang, PVC, For Non-Metallic Boxes

Extends an existing box by 1-1/8 in. Used to correct problems from remodeling where the wall surface is extended. Fits between the wiring device and the wall surface. Extends the switch or outlet box to flush with the wall. Works with all standard wiring devices. 2-1/4 in x 3-1/4 in. UL listed.