Metallics Knock-out Seal 2-1/2...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$56.79
$10.54
Metallics Seal 2-1/2 K-O Seal St-zn

Metallics Knock-out Seal 2-1/2" 3-Piece Steel Zinc Quick-Seal

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Model: 250KOS
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$56.79
$10.54
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Metallics Industries Knock-out Seal 2-1/2" 3-Piece Steel Zinc Quick-Seal

Professional Electrical Panel Box Sealing Solution

The Metallics Industries Knock-out Seal 2-1/2" delivers exceptional performance and reliability for electrical panel box installations and conduit system sealing. This steel knock-out seal with zinc finish provides dependable electrical sealing solutions designed for professional electricians, contractors, and industrial technicians, offering the proven quality and precision engineering that professionals trust from a leading manufacturer of electrical hardware and industrial fasteners.

Professional Features & Benefits

Quick-Seal Performance

  • 3-Piece Quick-Seal Design - Provides fast and secure plugging of holes in panel boxes with professional-grade steel construction and zinc finish for corrosion resistance
  • Size Stamped Identification - Clear size marking stamped directly on seal ensures proper selection and installation for 2-1/2" knock-out holes
  • Steel Construction with Zinc Finish - Durable steel material with protective zinc coating delivers long-lasting performance in electrical environments
  • Ultimate Safety Quality - Engineered for high-quality safety standards in electrical panel applications with reliable sealing performance

Professional Installation

  • Quick Installation Process - 3-piece design enables fast and efficient installation in panel boxes and electrical enclosures
  • Secure Hole Plugging - Effectively seals unused knock-out holes to maintain electrical safety and code compliance
  • Professional Dimensions - 6" x 6" x 1.4" overall dimensions with precise 2-1/2" sealing capability for standard electrical applications

Technical Specifications

Material: Steel | Finish: Zinc | Seal Size: 2-1/2" | Design: 3-Piece Quick-Seal | Overall Dimensions: 6" Length x 6" Width x 1.4" Height | Weight: 2.1 lbs | Pack Type: Bag | Number of Pieces: 3 | Product Type: Knock-out Seals | Application: Electrical, Plumbing, Heating and Air Conditioning Industries

Installation & Usage

  1. Verify the knock-out hole size matches the 2-1/2" seal specification
  2. Clean the panel box opening to ensure proper seal contact and fit
  3. Insert the 3-piece quick-seal components into the knock-out hole opening
  4. Secure the seal components according to the quick-seal design for tight closure
  5. Verify complete sealing of the knock-out hole for electrical safety compliance
  6. Inspect the installation to ensure proper seal engagement and panel box integrity

Professional Applications

Ideal for:

  • Electrical Panel Installations - Sealing unused knock-out holes in electrical panel boxes and distribution panels
  • Conduit System Applications - Plugging openings in electrical enclosures and conduit accessories
  • HVAC System Installations - Sealing electrical connections and panel openings in heating and air conditioning systems
  • Plumbing Electrical Work - Closing electrical panel openings in plumbing system electrical installations
  • Industrial Electrical Maintenance - Maintaining electrical safety in industrial panel boxes and control enclosures
  • Commercial Building Electrical - Professional electrical installations in commercial and institutional buildings
  • Electrical Code Compliance - Meeting electrical safety requirements for sealed panel box installations
  • Electrical Enclosure Sealing - Comprehensive sealing solutions for various electrical enclosure applications

Steel and Zinc Finish Advantage

The steel construction provides exceptional durability and strength for demanding electrical applications, while the zinc finish offers superior corrosion resistance and long-term performance in various environmental conditions. This combination ensures reliable sealing performance and extended service life in electrical, plumbing, and HVAC installations where moisture and environmental factors are concerns.

Why Choose Metallics Industries Quality?

Metallics Industries demonstrates unwavering commitment to precision manufacturing and quality control excellence in electrical hardware and industrial fastening solutions. Our professional-grade materials and protective finishes deliver reliable performance that contractors, electricians, and industrial professionals trust. With comprehensive testing standards and superior material selection, Metallics Industries provides dependable knock-out seals and electrical hardware solutions for commercial, industrial, and construction applications, ensuring electrical safety compliance and professional installation results.

Manufacturer Resources

Product Specs

Minimum Purchase:
10 units
Arra Compliant:
C
Buy American Compliant:
C
Country Of Origin:
MUL
Division:
Electrical H1
Field Application:
Electrical, Plumbing, Heating and Air Conditioning Industries
Language Code:
EN
Number Of Pieces:
3
Order Minimum Imperial:
10
Order Minimum Uom Imperial:
EA
Pack Type:
Bag
Product Family:
Electrical Supplies
Product Height:
1.4 in
Product Length:
6 in
Product Weight:
2.1 lbs
Product Width:
6 in
Sub Division:
Electrical-E H2
Product Type:
Knock-out seals
Product Group:
Conduit Accessories
Department:
Electrical
Product Subgroup:
Plugs and Seals
Type2:
3 Pieces Knock-Out Seal
Product Finish:
Zinc
Product Details:
3 Pieces Knock-Out Seal
Product Material:
Steel

Metallics 250KOS – Frequently Asked Questions

1) Will a 2-1/2 inch knock-out seal fill a knockout left by 2-1/2 inch conduit?
Yes. The Metallics 250KOS is sized for the knockout that a 2-1/2 inch trade-size conduit fitting leaves behind, and the size is stamped on the seal itself so it can be matched at the panel instead of guessed. Match the seal to the knockout diameter, not to the wire that used to run through it.
2) What is a knock-out seal actually for, and do I need one for an unused panel opening?
An open knockout in an energized enclosure leaves live parts reachable and lets dust and moisture in, so it has to be closed. The Metallics 250KOS plugs that hole from the panel face with a three-piece steel assembly that tightens into the opening. It's the fix for a knockout that was punched and never used, or one left behind when a conduit run was removed.
3) Do I need access to the back of the panel to install a Metallics knock-out seal?
No. The three-piece quick-seal draws together through the opening, so it installs from the face of the enclosure. That matters on a live panel or a flush-mounted load center where the back of the can is buried in the wall and a nut-and-washer type closure would be unworkable.
4) How many Metallics 250KOS seals do I have to buy at once?
Ten each is the order minimum, supplied in a bag. Worth knowing if you only have one open knockout: for a single panel repair you'll still be taking ten, so it's better suited to a service truck stock item or a job with several enclosures to close out.
5) Is the Metallics 250KOS knock-out seal Buy American compliant for a government job?
It carries both Buy American and ARRA compliance flags, which is what a federal, state or institutional spec typically asks for on electrical hardware. Country of origin is listed as multiple, so for a project that requires documented domestic origin on each shipment, that flag is the compliance record to reference rather than the origin code.
6) Does a knock-out seal come as one piece or do I have to assemble it?
Three pieces per seal. They go into the knockout as a set and pull tight against the panel wall to close the hole, so count on all three components being present before you start. The Metallics 250KOS ships as that complete three-piece assembly.
7) How much does a 2-1/2 inch steel knock-out seal weigh and how much room does it take up?
Each Metallics 250KOS runs 2.1 lbs and measures 6 x 6 x 1.4 inches packaged. The weight is the reason to think about the panel it's going into: this is a solid steel assembly, not a light snap plug, and on a large-diameter knockout in thin sheet the seal carries real mass on the enclosure wall.
How fast can I get the Metallics 250KOS 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 Metallics 250KOS come with a warranty?
Absolutely. The Metallics 250KOS 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 Metallics 250KOS?
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 Metallics 250KOS from ZenSupply?
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