Gardner Bender Metal Knockout ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$53.50
$3.90
Gardner Bender Metal Knockout Seal 16-Gauge Galvanized Steel 3/8" Thread

Gardner Bender Metal Knockout Seal 16-Gauge Galvanized Steel 3/8" Thread

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Model: KO703
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$53.50
$3.90
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Gardner Bender Metal Knockout Seal 16-Gauge Galvanized Steel 3/8" Thread

Professional knockout sealing solution for electrical enclosures

The Gardner Bender 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 3/8" thread, this professional-grade seal provides secure closure with embossed design for quick self-centering installation from inside or outside of the box.

Professional Features & Benefits

  • 16-Gauge Galvanized Steel Construction: Provides durable, rust-resistant performance for long-term reliability in electrical applications.
  • Embossed Self-Centering Design: Ensures quick, accurate positioning in unused knockouts for efficient installation.
  • 3/8" Thread Specification: Delivers secure threading engagement for reliable seal retention.
  • Zinc-Plated Hardware: Screw and bar feature zinc plating for enhanced corrosion resistance and professional appearance.
  • Single Screw Installation: One screw holds seal securely in place, simplifying installation process.
  • Size and Catalog Marking: Clearly marked for easy identification and proper installation verification.
  • Inside/Outside Installation: Versatile mounting capability allows installation from either side of the enclosure.

Technical Specifications

  • Each In Package Height In: 3
  • Each In Package Length Depth In: 3
  • Each In Package Weight Oz: 22.3
  • Each In Package Width In: 3

Professional Applications

  • Electrical Panel Sealing
  • Junction Box Closure
  • Control Enclosure Applications
  • Commercial Electrical Systems
  • Industrial Equipment Installations
  • Maintenance and Retrofit Projects
  • Code Compliance Requirements

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-term performance, while the embossed self-centering design and clear marking facilitate efficient installation in professional electrical applications.

Manufacturer Resources

Product Specs

Each In Package Height In :
3
Each In Package Length Depth In :
3
Each In Package Weight Oz :
22.3
Each In Package Width In :
3

Gardner Bender KO703 – Frequently Asked Questions

1) What size knockout does the Gardner Bender KO703 metal knockout seal fill?
The KO703 is the 3/8 inch thread size seal, so it closes the small 3/8 inch knockouts you find in panels and junction boxes. Each seal is marked with its size and catalog number, so once it is in you can verify at a glance that the right size went into the opening.
2) Can a knockout seal be installed after the box is already mounted to the wall?
Yes. The Gardner Bender knockout seal can be set from inside or outside the enclosure, so a box already fastened in place, or one where you can only reach the interior, is still workable. The embossed body self-centers in the opening and a single screw draws it tight.
3) Is a metal knockout seal better than a plastic snap-in plug for a commercial panel?
For commercial and industrial enclosures the steel seal is the one to reach for. The KO703 is 16-gauge cold-rolled galvanized steel with a zinc-plated screw and bar, so it holds up where a snap-in plastic plug would be the weak point for corrosion or physical abuse. Plastic plugs are quicker but are generally a residential or light-duty choice.
4) Do I need any extra hardware to install the Gardner Bender KO703 knockout seal?
No additional parts are needed. The seal comes with its own screw and bar, both zinc plated, and one screw is all that holds it in place. You only need a screwdriver.
5) Will a galvanized steel knockout seal rust in a damp mechanical room or outdoor enclosure?
The steel body is rust-proofed galvanized cold-rolled stock and the screw and bar are zinc plated, which is what gives it corrosion resistance in damp industrial and maintenance settings. It is a seal for unused knockouts, not a weatherproofing gasket, so a raintight enclosure still needs the fitting the enclosure rating calls for.
6) How much does a package of Gardner Bender KO703 knockout seals weigh and how big is the box?
The package measures 3 by 3 by 3 inches and weighs 22.3 ounces, which matters if you are pulling several sizes for a van stock or a job kit.
7) What is the part number to reorder the 3/8 inch Gardner Bender knockout seal?
Order it as Gardner Bender KO703. That designation covers the 3/8 inch thread metal knockout seal in 16-gauge galvanized steel.
How fast can I get the Gardner Bender KO703 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 Gardner Bender KO703 come with a warranty?
Absolutely. The Gardner Bender KO703 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 Gardner Bender KO703?
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 Gardner Bender KO703 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.
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