Bridgeport Fittings 1670 4" St...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$36.50
Bridgeport Fittings 1670 4" Steel Bushing Penny, Knockout Seal Plug

Bridgeport Fittings 1670 4" Steel Bushing Penny, Knockout Seal Plug

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Model: 1670

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

$36.50
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Bridgeport Fittings 1670 4" Steel Bushing Penny, Knockout Seal Plug

The Bridgeport Fittings 1670 is a 4" steel bushing penny designed to seal unused knockout openings in electrical panels, enclosures, and junction boxes. Also referred to as a knockout seal or knockout plug, this bushing penny is built to prevent foreign matter entry into electrical equipment, helping keep dust, debris, and other contaminants away from live components and wiring. Manufactured from steel, the Bridgeport Fittings 1670 bushing penny is sized specifically for 4" knockout openings, delivering a clean, snug fit without the need for additional fasteners. Electricians and contractors rely on bushing pennies like the 1670 to close off knockouts that are not being used for conduit entry, helping maintain the integrity and cleanliness of the enclosure interior. Sealing unused knockouts with a bushing penny like the 1670 supports a cleaner, better-protected enclosure interior, whether on new installations or retrofit projects.

Key Features

  • Trade Size: 4" bushing penny engineered to seal 4" knockout openings in panels, boxes, and enclosures.
  • Durable Steel Construction: Manufactured from steel for a rugged, long-lasting seal that stands up to the demands of commercial and industrial environments.
  • Foreign Matter Protection: Solid, penny-style design prevents foreign matter entry, shielding internal wiring and components from dust, debris, and moisture intrusion.
  • Bushing Penny Design: Purpose-built knockout seal plug that closes unused knockouts cleanly, keeping enclosures neat and protected.
  • Drop-In Installation: Installs directly into an existing 4" knockout opening for a fast, tool-minimal installation.
  • Enclosure Compatibility: Suited for use in panelboards, load centers, junction boxes, and other electrical enclosures with unused 4" knockouts.
  • Versatile Use: A cost-effective way to seal off knockouts that are not currently needed for conduit runs, keeping enclosure interiors clean during installation or future expansion.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Sealing Unused Knockouts in Panelboards and Load Centers
  • Electrical Enclosures and Junction Boxes
  • Commercial and Industrial Electrical Installations
  • Protecting Wiring Compartments from Dust and Debris Intrusion
  • New Construction and Retrofit Electrical Work

Why Bridgeport Fittings?

Bridgeport Fittings manufactures the 1670 bushing penny from steel to deliver a dependable, long-lasting seal for unused knockout openings. By preventing foreign matter entry, this bushing penny helps electrical contractors maintain clean, well-protected enclosures on commercial and industrial job sites. With straightforward drop-in installation, the 1670 offers electricians a fast and effective way to seal off 4" knockouts wherever they are not in use. Choose the Bridgeport Fittings 1670 for a simple, effective solution to sealing 4" knockouts during new construction, renovations, and ongoing maintenance.

Manufacturer Resources

Product Specs

list_batch:
BPF-20260918
Product Type:
Conduit Plug
Department:
Electrical
Product Subgroup:
Conduit Fittings
Product Material:
Steel
Product Size:
4"
Product Group:
Conduit & Raceway

Bridgeport Fittings 1670 – Frequently Asked Questions

1) What size knockout does the Bridgeport Fittings 1670 bushing penny seal?
The 1670 is sized for 4 inch knockout openings, and only 4 inch. It drops straight into an existing 4 inch knockout in a panelboard, load center, junction box or other enclosure. If the opening in your can is a smaller trade size, this is the wrong part and you need the matching penny for that size.
2) Do I need any extra hardware or a locknut to install a 4 inch bushing penny?
No added fasteners are called for. The 1670 penny is made to sit in the 4 inch knockout for a snug fit with tool-minimal, drop-in installation, so there is nothing else to order alongside it to close the opening.
3) Is the 1670 knockout seal steel or plastic?
Steel. Bridgeport's 1670 penny is a steel knockout seal, which is what most inspectors and spec writers expect on a metal panelboard or industrial enclosure rather than a snap-in plastic plug.
4) Why seal an unused 4 inch knockout at all instead of leaving it open?
An open 4 inch knockout lets dust, debris and moisture reach live parts and wiring inside the enclosure. The 1670 penny closes it off so the wiring compartment stays clean and protected, which is why electricians fit them on both new construction and retrofit work, including openings being held for a future conduit run.
5) What is the manufacturer part number for the Bridgeport 4 inch steel bushing penny?
Order it as Bridgeport Fittings 1670. That number covers the 4 inch steel bushing penny, and 4 inch is the only size offered under it.
6) Can I use the 1670 penny in a load center or panelboard, not just a junction box?
Yes. It suits panelboards, load centers, junction boxes and other electrical enclosures that have an unused 4 inch knockout, in commercial and industrial installations alike. The only requirement is that the opening is a 4 inch knockout.
7) Knockout seal vs. bushing penny vs. knockout plug: are they the same thing?
Same part, different names on the job. The Bridgeport 1670 is catalogued as a bushing penny and is also called a knockout seal or knockout plug. All three terms describe the solid, penny-style disc that closes a knockout not being used for a conduit entry.
How fast can I get the Bridgeport Fittings 1670 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 Bridgeport Fittings 1670 come with a warranty?
Absolutely. The Bridgeport Fittings 1670 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 Bridgeport Fittings 1670?
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 Bridgeport Fittings 1670 from ZenSupply?
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