Topaz Lighting RB-18 Malleable...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$16.65
Topaz Lighting RB-18 Malleable Iron Threaded Reducing Bushing, Rigid/IMC

Topaz Lighting RB-18 Malleable Iron Threaded Reducing Bushing, Rigid/IMC

(No reviews yet) Write a Review

Model: RB18

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

$16.65
Adding to cart… The item has been added
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

Topaz Lighting RB-18 Malleable Iron Threaded Reducing Bushing, Rigid/IMC

The Topaz Lighting reducing bushing series is engineered from malleable iron for Rigid and IMC conduit installations that require a precise size transition between larger and smaller conduit runs. This threaded reducing bushing line is available in sizes from 1-1/4" through 3-1/2", including the RB24 configuration, which delivers a 3" x 2-1/2" reduction for common commercial and industrial applications. Built for durability, the malleable iron construction provides strong corrosion resistance and long-term reliability, while the threaded connection ensures a secure, tight fit that maintains electrical continuity and helps prevent moisture ingress at the conduit junction.

Key Features

  • Trade Size Range: Available from 1-1/4" up to 3-1/2", including the RB24 3" x 2-1/2" configuration, for versatile installation requirements and system compatibility.
  • Durable Construction: Malleable iron construction delivers exceptional durability and corrosion resistance for reliable, long-term performance in demanding environments.
  • Threaded Connection: Threaded design ensures secure, tight connections that maintain electrical continuity and prevent moisture ingress at every junction.
  • Rigid/IMC Compatibility: Designed for use with Rigid and IMC conduit systems, ensuring proper fit with standard conduit fittings and raceway components.
  • Precision Manufacturing: Accurate threading and dimensions ensure proper fit with standard conduit systems, reducing installation time and rework.
  • Professional Grade Material: Malleable iron provides superior strength compared to standard materials, making it suitable for critical electrical installations in commercial and industrial settings, from panelboard enclosures to raceway junctions.

Technical Specifications

  • Conduit Type: Rigid/IMC
  • Trade Size Range: 1-1/4" - 3-1/2"
  • Pack Size: 100
  • PDF:Spec Sheet: https://zensupply.com/content/pdf/topaz-lighting/spec-sheet-16663a.pdf
  • PDF:Topaz Electrical Fittings & Supplies Catalog: https://zensupply.com/content/pdf/topaz-lighting/topaz-electrical-fittings-supplies-catalog.pdf

Typical Applications

  • Commercial and Industrial Electrical Installations
  • Conduit Size Transition and Raceway Systems
  • Rigid and IMC Conduit Fitting Assemblies
  • Maintenance, Retrofit, and Renovation Projects
  • Professional Electrical Contracting and New Construction
  • Industrial Conduit Systems Requiring Reliable Size Reduction

Why Topaz Lighting?

Topaz Lighting reducing bushings are built from malleable iron with precision-threaded connections, ensuring reliable conduit size transitions and long-term system integrity for professional electricians and contractors across the full 1-1/4" to 3-1/2" size range, including the RB24 3" x 2-1/2" configuration. Quality materials and accurate manufacturing tolerances provide dependable, code-compliant performance across commercial and industrial electrical installations. When reliable conduit connections matter, Topaz Lighting delivers the professional-grade components that get the job done right, run after run.

Product Specs

Product Type:
Reducing Bushing
Conduit Type:
Rigid/IMC
Connection Type:
Threaded
Department:
Electrical
Product Group:
Conduit & Raceway
Product Subgroup:
Conduit Bodies & Fittings
Product Material:
Malleable Iron
Pack size (unit):
100
Product Size:
1-1/4" - 3-1/2"

Topaz Lighting RB18 – Frequently Asked Questions

1) Will a Topaz reducing bushing work on rigid conduit and IMC, or only one of them?
Both. The Topaz RB reducing bushings are made for Rigid and IMC conduit, which share the same NPT-style threading, so one bushing covers either raceway type on the job.
2) What sizes do the Topaz RB threaded reducing bushings come in?
The range runs 1-1/4 inch through 3-1/2 inch. Orderable sizes are 1-1/4 inch (RB18), 2 inch (RB29), 2-1/2 inch (RB27), 3 inch (RB22), 3-1/2 inch (RB28), plus the RB24, which is a 3 inch by 2-1/2 inch reduction.
3) I need to drop a 3 inch rigid run down to 2-1/2 inch. Which Topaz part is that?
That is the RB24. It is the 3 inch by 2-1/2 inch reduction in the Topaz malleable iron reducing bushing line, threaded for Rigid and IMC.
4) Can I use a Topaz RB bushing on EMT?
No. These are threaded fittings for Rigid and IMC conduit. EMT is unthreaded and needs set-screw or compression fittings, so an RB bushing has nothing to thread onto.
5) Are Topaz reducing bushings sold individually or by the box?
Pack size is 100 pieces. That suits a contractor stocking a truck or an MRO storeroom standardizing on one size, but it is worth knowing before you order a single fitting for one junction.
6) Is malleable iron the right choice for a reducing bushing in a wet or industrial location?
Malleable iron is what these bushings are made from, and it gives more strength and corrosion resistance than lighter fitting materials. The threaded joint pulls up tight, which maintains electrical continuity through the raceway and helps keep moisture out at the junction.
7) What does a reducing bushing actually do, and is it the same as a reducing washer?
A threaded reducing bushing transitions a larger conduit thread down to a smaller one, so you can land a smaller conduit or fitting on a larger hub or enclosure opening. The Topaz RB series does that for Rigid and IMC runs. Reducing washers are a different part, used in pairs to shrink an oversized knockout in sheet metal, and they do not thread onto conduit.
8) Where can I get the manufacturer spec sheet for the Topaz reducing bushings?
Topaz publishes a spec sheet for the RB reducing bushing line as well as the full Topaz Electrical Fittings and Supplies catalog, both available as PDFs if you need submittal documentation for a job.
How fast can I get the Topaz Lighting RB18 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 RB18 come with a warranty?
Absolutely. The Topaz Lighting RB18 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 RB18?
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 RB18 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
!