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RACO 128 4 in. Octagon Extension Ring, Drawn Steel, 1-1/2 in. Deep
The RACO 128 is a 4 in. octagon extension ring built from drawn steel to add depth and wiring capacity to an existing octagon box. Measuring 1-1/2 in. deep and featuring four 1/2 in. knockouts, this extension ring is designed for conduit wiring systems and ships with no bracket for direct box-to-box mounting. It is cULus Listed for use in residential and commercial electrical installations where additional box volume or knockout access is needed.
Key Features
- Trade Size: 4 in. octagon configuration matches standard octagon boxes for a clean, code-compliant extension.
- Durable Construction: Drawn steel body provides a strong, seamless extension ring for long-term reliability.
- Depth: 1-1/2 in. deep profile adds usable volume and wire capacity to an installed box.
- Knockouts: Four 1/2 in. knockouts allow for additional conduit entries as the circuit expands.
- Wiring System: Engineered for conduit wiring systems for controlled, code-compliant raceway installations.
- Bracket Type: No bracket, allowing the ring to mount directly to the existing box for a low-profile extension.
Certifications & Compliance
- cULus Listed
Technical Specifications
- Product Type: Steel Boxes and Covers
- Product Depth: 1.5 in
- Drawn or Welded: Drawn
- Bracket Type: No Bracket
- Wiring System: Conduit
- Knockouts: 1/2 in
- Certified Listed: cULus Listed
Typical Applications
- Residential and Commercial Electrical Installations
- Extending Existing Octagon Boxes
- Conduit Wiring Systems
- Ceiling and Wall Box Depth Extensions
- Renovation and New Construction Wiring
Why RACO?
RACO builds this extension ring from drawn steel for a strong, seamless body that stands up to demanding jobsite conditions, and its cULus Listed status confirms it meets recognized safety standards for electrical installations. With a 4 in. octagon profile, 1-1/2 in. depth, and four 1/2 in. knockouts, the RACO 128 gives electricians a dependable, code-compliant way to add capacity to existing octagon box installations.
Manufacturer Resources
Spec Sheet
Product Specs
- list_batch:
- RACO-20260916
- Product Type:
- Box Extension Ring
- Product Depth:
- 1.5 in
- Drawn or Welded:
- Drawn
- Bracket Type:
- No Bracket
- Wiring System:
- Conduit
- Knockouts:
- 1/2 in
- Certified Listed:
- cULus Listed
- Department:
- Electrical
- Product Subgroup:
- Electrical Boxes
- Product Group:
- Boxes & Enclosures
RACO RACO128 – Frequently Asked Questions
1) Will the RACO 128 extension ring fit a standard 4 inch octagon box?
Yes. The RACO 128 is a 4 inch octagon extension ring, so it lands on the same footprint as a standard 4 inch octagon box and mounts directly box-to-box. It carries no bracket, which keeps the assembly flush to the existing box rather than adding a mounting ear to work around.
2) How much depth does the RACO 128 add to an existing octagon box?
It adds 1-1/2 inches of depth. That extra volume is what you use when an octagon box is crowded with conductors or when a fixture canopy or device needs more room behind it. Note that it extends an existing box, it is not a box on its own, so you still need the octagon box already set in the ceiling or wall.
3) Can I use the RACO 128 to gain wire fill capacity in an overcrowded ceiling box?
That is the main use for it. Adding the 1-1/2 inch ring increases the cubic volume of the installed octagon box, which is how you legally get more conductors into an existing ceiling or wall box during a renovation without cutting out and replacing the box. Total box volume for fill calculations is the original box plus the ring.
4) What size conduit knockouts does the RACO 128 octagon extension ring have?
Four 1/2 inch knockouts, one on each of four sides. That takes 1/2 inch trade size conduit or connectors, and it means you can bring an added circuit into the ring itself instead of opening up the box behind it.
5) Is the RACO 128 meant for conduit or for NM cable work?
It is built for conduit wiring systems. The 1/2 inch knockouts are sized for conduit and connectors, so it suits commercial raceway work and renovations where the existing run is in pipe. If you are pulling NM cable, you would want a ring set up with cable clamps instead.
6) What is the difference between a drawn and a welded steel extension ring?
The RACO 128 is drawn, meaning the body is formed from a single piece of steel with no welded corner seams. Welded rings are assembled from formed sections joined at the corners. For an extension ring that gets torqued down against an existing box and may carry a fixture load, the seamless drawn body is the sturdier of the two constructions.
How fast can I get the RACO RACO128 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
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Can I return it if it doesn’t work for me?
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reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the RACO RACO128 come with a warranty?
Absolutely. The RACO RACO128 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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