Thomas & Betts SBEX Steel City Adjustable 1-Gang Switch Box Extension, 3.5 Cu. In. Pre-Galvanized Steel

Thomas & Betts SBEX Steel City Adjustable 1-Gang Switch Box Extension, 3.5 Cu. In. Pre-Galvanized Steel

The Thomas & Betts SBEX is a Steel City 1-Gang Adjustable Switch Box Extension built in pre-galvanized steel to extend existing single-gang device boxes for switches and receptacles. This adjustable extension ring accommodates up to 7/8-Inch of additional box depth and adds 3.5-Cubic-Inch of usable wiring volume, giving electricians a fast, reliable fix when wall finishes such as tile, paneling, or extra layers of drywall push a device box below the required flush mounting depth. Part of the trusted Steel City product line from Thomas & Betts, the SBEX restores a recessed 1-gang switch or device box to a code-compliant depth without pulling and replacing the entire box, saving both labor and material on renovation and remodel work. It is a purpose-built accessory for electricians who need a dependable way to correct box depth in the field rather than sourcing and installing a brand-new box assembly.

Key Features

• Adjustable Depth: Extends up to 7/8-Inch, allowing the device box face to be brought flush with the finished wall surface.
• Durable Construction: Pre-galvanized steel construction resists corrosion and provides long-term durability in standard electrical installations.
• Single-Gang Design: Sized to match standard 1-gang switch and device box openings for a precise, secure fit.
• 3.5-Cubic-Inch Capacity: Adds usable wiring volume to help maintain proper box fill as device depth is extended.
• Steel City Product Line: Manufactured as part of the Steel City line from Thomas & Betts, a recognized name in steel electrical boxes and fittings.
• Purpose-Built Extension: Designed specifically to extend an existing 1-gang switch box rather than requiring a full box replacement.
• Renovation-Ready: Ideal for correcting box depth after adding tile, paneling, or additional drywall layers to a finished wall.

Technical Specifications

• Refer to manufacturer documentation for complete technical specifications.

Typical Applications

• Extending Recessed 1-Gang Switch and Device Boxes
• Renovation and Remodel Electrical Work
• Correcting Box Depth Behind Tile, Paneling, or Added Drywall
• Residential and Commercial Wiring Extensions
• Code-Compliant Box Depth Adjustments

Why Thomas & Betts?

Thomas & Betts backs the Steel City line with pre-galvanized steel construction built for reliable, jobsite-ready performance. The SBEX switch box extension gives electricians a straightforward way to correct box depth issues without the added labor and cost of a full box replacement, reflecting the practical, trade-tested engineering behind the Steel City brand and its 1-gang box accessories. It's a small part that solves a common finishing problem, keeping installations on schedule and up to code.