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

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.