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RACO 187 4 in. Square Steel Box Extender, 1-1/2 in. Deep, with Multiple KO's for Switch Boxes
The RACO 187 is a 4 in. square steel box extender engineered to add usable depth to existing switch boxes and junction boxes within conduit wiring systems. Built with a drawn steel body and no mounting bracket, this extender measures 1-1/2 in. deep and includes multiple knockouts — 1/2 in. and 3/4 in. — to accommodate flexible conduit entry from multiple directions. The square shape matches standard 4 in. switch box dimensions for a clean, secure fit, and the RACO 187 is UL Listed for reliable performance across commercial and residential electrical installations.
Key Features
- Trade Size: 4 in. square extender adds 1-1/2 in. of usable depth to existing switch and junction boxes.
- Durable Steel Construction: Fabricated from drawn steel for strength and long-term durability in conduit installations.
- Drawn Fabrication: Drawn, not welded, construction provides a smooth, seamless box body.
- Multiple Knockouts: Includes 1/2 in. and 3/4 in. knockouts for flexible conduit entry from multiple directions.
- No Bracket Design: Ships without a mounting bracket for direct box-to-box surface mounting.
- Conduit Wiring System: Engineered specifically for conduit wiring system installations.
- Square Profile: 4 in. square shape matches standard switch box dimensions for a clean, aligned fit.
Certifications & Compliance
- UL Listed
Technical Specifications
- Product Type: Steel Box
- Product Size: 4 in
- Product Depth: 1.5 in
- Product Shape: Square
- Drawn or Welded: Drawn
- Bracket Type: No Bracket
- Wiring System: Conduit
- Knockouts: 1/2 in;3/4 in
- Certified Listed: UL Listed
Typical Applications
- Switch Box Depth Extensions
- Junction Box Modifications
- Conduit Wiring Systems
- Commercial and Residential Electrical Installations
- Renovation and Retrofit Wiring Projects
Why RACO?
RACO steel boxes and box extenders are engineered for durable, code-compliant performance on demanding job sites. The drawn steel construction of the 187 extender delivers a rigid, seamless body, while the UL Listing provides added assurance for professional electrical work. With multiple knockouts and a square profile built to match standard switch box dimensions, the RACO 187 offers a practical, dependable solution for extending box depth in conduit wiring systems.
Manufacturer Resources
Spec Sheet
Product Specs
- list_batch:
- RACO-20260916
- Product Type:
- Steel Box
- Product Size:
- 4 in
- Product Depth:
- 1.5 in
- Product Shape:
- Square
- Drawn or Welded:
- Drawn
- Bracket Type:
- No Bracket
- Wiring System:
- Conduit
- Knockouts:
- 1/2 in;3/4 in
- Certified Listed:
- UL Listed