RACO 278 4" Octagon 3-1/2" Deep Concrete Ring, Pack of 100

RACO 278 4" Octagon 3-1/2" Deep Concrete Ring, Pack of 100

The RACO 278 is a 4" octagon concrete ring engineered to extend standard octagon electrical boxes so they sit flush with poured concrete floors, walls, and ceilings. This concrete ring measures 3-1/2" deep, giving commercial and industrial electricians the additional depth needed when boxes are set below the final concrete surface during rough-in construction. Designed to mate with standard 4" octagon boxes, the 278 helps crews maintain accurate box height and consistent device placement across a job site. Packaged 100 rings to a case, it's built for high-volume new construction and renovation projects that call for reliable, code-ready box extensions in concrete.

Key Features

• Trade Size: 4" octagon configuration matches standard octagon box sizing for straightforward, drop-in alignment during rough-in.
• Depth: 3-1/2" deep ring supplies the extra depth needed to bring a recessed octagon box flush with the finished concrete surface.
• Concrete Ring Design: Purpose-built extension ring for octagon boxes installed in concrete floors, walls, and ceilings ahead of the pour.
• Consistent Fit: Sized to standard octagon box dimensions so covers, plaster rings, and devices seat correctly once installation is complete.
• Rough-In Efficiency: Helps crews avoid re-setting boxes after a concrete pour by extending box depth to the finished surface in a single step.
• Bulk Packaging: Supplied in a case pack of 100 units, cutting down on per-unit handling and reorder frequency on large rough-in jobs.
• Jobsite Ready: Uniform sizing across the case supports repeatable installation quality on multi-unit commercial and residential projects.
• Material Handling: Uniform ring dimensions simplify inventory and box-fill planning when ordering by the case for multi-building projects.

Technical Specifications

• Pack size (unit): 100

Typical Applications

• Concrete Floor and Ceiling Box Installations
• Commercial and Industrial Rough-In Wiring
• Octagon Box Depth Extension in Concrete Construction
• New Construction and Concrete Slab Pours
• Multi-Family and Commercial Renovation Projects
• Electrical Box Leveling and Flush-Mount Alignment

Why RACO?

RACO electrical boxes and accessories are a longstanding choice for electrical contractors who need dependable, consistently sized components for rough-in work. The 278 concrete ring is sized and packaged for the demands of production electrical crews, helping keep octagon box installations aligned and flush across large concrete pours. Stocking a full case of 100 rings under a single RACO 278 specification means every box on the job gets the same fit and finish, simplifying inspection and reducing callbacks. Whether you're wiring a single tenant space or a multi-story build, the RACO 278 delivers the fit consistency contractors expect from RACO box products.