SEPCO SS48 3-Piece Flat Knocko...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$10.54
SEPCO SS48 3-Piece Flat Knockout Seal, Zinc-Plated Steel

SEPCO SS48 3-Piece Flat Knockout Seal, Zinc-Plated Steel

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Model: SS62

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

$10.54
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SEPCO SS48 3-Piece Flat Knockout Seal, Zinc-Plated Steel

The SEPCO SS48 is a 3-piece flat knockout seal built from zinc-plated steel, engineered to close unused knockout openings in electrical panelboards, enclosures, and boxes. This family of knockout seals is available in trade sizes ranging from 2-1/2" to 4", covering the most common knockout openings found on panelboards and enclosures. The zinc-plated finish delivers dependable corrosion resistance for long-term performance in professional electrical installations, while the low-profile flat design keeps dust, moisture, and debris away from internal wiring and components. Electricians and maintenance crews rely on knockout seals like the SEPCO SS48 to keep panelboards and boxes code-ready whenever a knockout is removed but not put into immediate use.

Key Features

  • Trade Size Range: Available in 2-1/2", 3", and 4" trade sizes to fit a range of unused knockout openings.
  • Durable Construction: Zinc-plated steel construction resists corrosion and supports long-lasting performance in typical indoor and outdoor electrical environments.
  • 3-Piece Design: The three-piece configuration allows for straightforward installation and a secure, flush fit over unused knockout openings, without requiring specialty tools.
  • Flat, Low-Profile Seal: The flat seal profile sits flush against the enclosure surface for a clean, finished appearance without obstructing surrounding components or wiring.
  • Knockout Seal Function: Effectively closes unused knockout holes in panelboards, boxes, and enclosures, helping protect internal wiring, terminations, and components from contaminants.
  • Finish: The zinc-plated finish adds an extra layer of corrosion resistance for demanding job-site conditions and long-term outdoor or damp-area exposure.
  • Steel Build: Solid steel base construction provides the rigidity needed for a secure, lasting seal over standard knockout openings.

Technical Specifications

  • Trade Size: 2-1/2" - 4"

Typical Applications

  • Electrical Panelboards and Enclosures
  • Conduit and Raceway Systems
  • Commercial and Industrial Electrical Installations
  • Electrical Contractor Job Sites
  • Renovation and New Construction Projects

Why SEPCO?

SEPCO knockout seals are built from zinc-plated steel for dependable corrosion resistance in everyday electrical work. Offered in 2-1/2" through 4" trade sizes, the 3-piece flat design offers a practical, easy-to-install solution for closing unused knockouts while helping keep enclosures protected from dust, moisture, and debris. SEPCO's straightforward, no-frills construction makes this seal a reliable choice for electricians and facility maintenance teams who need dependable components for professional, code-compliant electrical projects.

Manufacturer Resources

SEPCO Product Catalog

Product Specs

list_batch:
SEP-20260911
Product Finish:
Zinc-Plated
Product Type:
Gland Plate & Entry Seal
Configuration:
3-Piece Flat Seal
Department:
Electrical
Product Group:
Boxes & Enclosures
Product Subgroup:
Enclosure Accessories
Product Material:
Steel

SEPCO SS62 – Frequently Asked Questions

1) What trade sizes does the SEPCO SS48 knockout seal come in?
Three sizes cover the large knockouts: 2-1/2 inch (MPN SS62), 3 inch (SS64), and 4 inch (SS68). You order by the trade size of the knockout you are closing, which matches the conduit trade size that punched it, so a 3 inch knockout takes the SS64.
2) Do I need a special tool to install a SEPCO SS48 flat knockout seal?
No specialty tool. It is a three-piece flat seal that assembles through the opening and draws tight to sit flush against the enclosure wall, so hand tools are enough. That also means you can fit it on an energized panel cover or an enclosure you cannot get behind cleanly.
3) Is a zinc-plated steel knockout seal suitable for an outdoor or damp-location enclosure?
The SS48 seal is zinc-plated steel, which the manufacturer rates for corrosion resistance in typical indoor and outdoor electrical environments, including damp areas. It is a mechanical closure, not a gasketed watertight fitting, so on a washdown or wet-location enclosure where the rating has to be maintained, verify the seal type your enclosure spec calls for.
4) Why bother sealing an unused knockout in a panelboard instead of leaving it open?
An open knockout leaves the enclosure interior exposed, so dust, moisture, and debris reach wiring and terminations, and the enclosure no longer presents a closed cover. The SS48 flat seal closes the hole flush so the panelboard or box is back to a finished, closed condition after a knockout has been punched but not used.
5) Will the SS48 seal stick out and interfere with a panel cover or adjacent gutter space?
It is a flat, low-profile seal that sits flush against the enclosure surface, so it does not project into the wireway or foul a cover or neighboring components. That matters on crowded panelboard sides where a domed or bolt-style closure would eat bending space.
6) Can I use the SEPCO SS48 on a steel enclosure wall of any thickness, like a heavy-gauge industrial cabinet?
The three-piece seal clamps on the sheet from both sides over the knockout, and SEPCO lists it for panelboards, boxes, and enclosures in commercial and industrial installations. Match the seal to the knockout trade size (2-1/2, 3, or 4 inch); the wall it mounts to is the standard enclosure sheet steel those knockouts are punched in.
How fast can I get the SEPCO SS62 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 SEPCO SS62 come with a warranty?
Absolutely. The SEPCO SS62 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 SEPCO SS62?
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 SEPCO SS62 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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