3/8" Single Gang Outlet Box Extenders, UL Listed, Electrical Box Extender for Outlets & Switches, Pack of 3

Specifications

• UL Listed Safety: UL Listed indicates the product has been evaluated to meet applicable UL safety requirements for intended use. Non-flammable, self-extinguishing material. Patented flange helps it sit snug and flush with the wall surface (no gaps). Clear CU IN marking supports box-fill documentation/inspection
• Standard Interior Boxes Only: Fits PVC, metal, or fiberglass electrical boxes for old work or new work. Not compatible with exterior waterproof boxes (oversized, require watertight fittings/covers)
• Easy Install: No need to remove or reposition the existing box—align the extender and fasten in place. Sizing tip: Measure the gap from box edge to finished wall; between sizes, size up
• Rigid, Durable One-Piece Design: Provides a professional finish and helps prevent shifting spacers, uneven gaps, and rework
• What’s Included: Outlet box extenders only (hardware not included). Pack of 3. Designed to help protect wiring and bring devices flush for a clean finished look