Topaz Lighting WRB 4" Round 4-...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$6.36
Topaz Lighting WRB 4" Round 4-Hole Extension Ring, Copper-Free Aluminum

Topaz Lighting WRB 4" Round 4-Hole Extension Ring, Copper-Free Aluminum

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Model: WRB450EXT

In Stock (leaves warehouse same day if ordered before 3pm ET)

$6.36
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Topaz Lighting WRB 4" Round 4-Hole Extension Ring, Copper-Free Aluminum

The Topaz Lighting WRB 4" Round 4-Hole Extension Ring is a weatherproof electrical fitting engineered to expand the cubic capacity of standard 4" round boxes while delivering a clean, flush finish. Fabricated from corrosion-resistant, copper-free aluminum, this extension ring is UL approved for use in wet locations and is available in 1/2" and 3/4" trade sizes to match your conduit connection. It ships complete with gaskets and mounting screws for straightforward, code-compliant installation, and is backed by Topaz Lighting's lifetime guarantee.

Key Features

  • Trade Size: Available in 1/2" and 3/4" trade sizes, engineered as a companion to standard 4" round electrical boxes to increase cubic capacity.
  • 4-Hole Configuration: Four mounting holes provide secure, stable attachment and flexible positioning during installation.
  • Durable Construction: Fabricated from copper-free aluminum for excellent corrosion resistance in demanding indoor and outdoor environments.
  • Flush Finish: Expands box depth while maintaining a flush surface finish for a professional, finished appearance.
  • Complete Installation Kit: Includes gaskets and mounting screws for a ready-to-install, weathertight assembly right out of the package.
  • Wet Location Rated: UL approved for use in wet locations, suitable for exposed outdoor and damp-area applications.
  • Color: Available in gray to blend with standard electrical enclosures and covers.

Certifications & Compliance

  • cULus Listed
  • UL Approved for Use in Wet Locations

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Expanding cubic capacity of 4" round electrical boxes in commercial and residential wiring systems
  • Outdoor and wet-location electrical installations requiring weatherproof fittings
  • Conduit and raceway junction box assemblies
  • New construction and renovation electrical rough-in work

Why Topaz Lighting?

Topaz Lighting manufactures a complete line of cULus listed weatherproof electrical fittings built to last across multiple commercial and residential applications. The copper-free aluminum construction and wet-location UL approval reflect Topaz's commitment to code-compliant, corrosion-resistant performance in the field. Every fitting is backed by Topaz Lighting's lifetime guarantee, giving electrical professionals confidence in long-term reliability.

Product Specs

Product Type:
Extension Ring
Listing:
cULus
Department:
Electrical
Product Group:
Boxes & Enclosures
Product Subgroup:
Electrical Boxes
Product Material:
Copper-Free Aluminum
Product Color:
Gray
Product Size:
1/2" - 3/4"
Configuration:
4-Hole Round

Topaz Lighting WRB450EXT – Frequently Asked Questions

1) Will the Topaz WRB extension ring fit a standard 4 inch round weatherproof box?
Yes. The WRB extension ring is a 4 inch round, 4-hole ring made as a companion to standard 4 inch round boxes, and it bolts up through those four mounting holes. Its job is to add cubic capacity to the box when you are running out of room for conductors or a device, while keeping the cover surface flush.
2) Can this extension ring be used outdoors in the rain?
It can. The Topaz WRB ring is UL approved for use in wet locations and is cULus listed, so it is suited to exposed exterior boxes, not just damp interior spots. The copper-free aluminum body is there for corrosion resistance in that exposure.
3) Do I need to buy gaskets and screws separately for the Topaz WRB ring?
No. Gaskets and mounting screws ship in the package, so the weathertight assembly is complete out of the box. What you still supply is the box itself, the conduit fittings, and whatever cover or device goes on the face.
4) I am short on box fill in a 4 inch round outdoor box. Is an extension ring the right fix?
That is exactly what the WRB is for. Rather than replacing the box or pulling a deeper one, the ring stacks onto the existing 4 inch round box and adds cubic inches for conductors and splices, then takes the cover flush on top. It is common on renovation work where an added circuit pushed the original box over fill, and because it is wet-location approved you can do it on an exterior box without losing the weatherproof rating.
5) Why copper-free aluminum instead of plain aluminum on an outdoor electrical fitting?
Copper content in aluminum castings is what drives galvanic and pitting corrosion in wet and coastal air. The WRB ring is fabricated copper-free specifically for corrosion resistance in demanding indoor and outdoor environments, which is why it holds up on exposed exterior boxes over time.
6) What color is the Topaz WRB extension ring, and will it match my existing weatherproof covers?
Gray, chosen to blend with standard electrical enclosures and covers. On a facility where the weatherproof boxes and covers are already the usual gray, the ring disappears into the assembly rather than standing out.
How fast can I get the Topaz Lighting WRB450EXT delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Topaz Lighting WRB450EXT come with a warranty?
Absolutely. The Topaz Lighting WRB450EXT is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Topaz Lighting WRB450EXT?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Topaz Lighting WRB450EXT from ZenSupply?
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