Gardner Bender 3/8" Thread Metal Knockout Seal with Self-Centering Design

Gardner Bender 3/8" Thread Metal Knockout Seal with Self-Centering Design

Professional knockout sealing solution for electrical enclosures

The Gardner Bender 3/8" Thread Metal Knockout Seal delivers reliable sealing performance for unused knockouts in electrical boxes and enclosures. Constructed from 16-gauge rust-proofed, cold-rolled galvanized steel with zinc-plated hardware, this professional-grade seal installs quickly from inside or outside of the box with embossed self-centering design for precise positioning.

Professional Features & Benefits

• 16-Gauge Galvanized Steel Construction: Provides durable, corrosion-resistant sealing that maintains integrity in demanding electrical environments.
• 3/8" Thread Specification: Ensures proper fit and secure installation in standard knockout openings for reliable long-term performance.
• Self-Centering Embossed Design: Eliminates guesswork during installation with quick, accurate positioning in unused knockouts.
• Single Screw Installation: Streamlines the sealing process with simple, secure mounting that holds the seal firmly in place.
• Zinc-Plated Hardware: Screw and bar components resist corrosion and provide lasting durability in various environmental conditions.
• Inside/Outside Installation Capability: Offers installation flexibility to accommodate different box configurations and access requirements.
• Size and Catalog Marking: Clearly marked identification ensures proper selection and simplifies inventory management.

Technical Specifications

• Each In Package Height In: 5.25
• Each In Package Length Depth In: 1.25
• Each In Package Weight Oz: 64.3
• Each In Package Width In: 5.13

Installation & Operation

1. Mount the unit in a suitable location with appropriate clearance and access for connections and service.
2. Connect utility and load conductors following applicable guidelines and the manufacturer's instructions.
3. Wire generator or power input according to the provided voltage/phase specifications and compatible capacity.
4. Configure any available load management or control features as supported by the provided specifications.
5. Test automatic transfer or operational functionality and verify proper performance before placing into service.
6. Complete final inspection and follow ongoing maintenance practices appropriate to the product category.

Professional Applications

• Electrical Panel Sealing
• Junction Box Maintenance
• Commercial Electrical Installations
• Industrial Enclosure Sealing
• Residential Electrical Upgrades
• Maintenance and Retrofit Projects
• Code Compliance Applications

Why Choose Gardner Bender Quality?

Gardner Bender knockout seals combine professional-grade materials with practical design features for reliable electrical enclosure sealing. The rust-proofed galvanized steel construction and zinc-plated hardware ensure long-lasting performance, while the embossed self-centering design and clear marking system support efficient installation and maintenance practices.