SEPCO SS50 Series Zinc-Plated ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$0.70
SEPCO SS50 Series Zinc-Plated Steel Flat Knockout Seal for Electrical Enclosures

SEPCO SS50 Series Zinc-Plated Steel Flat Knockout Seal for Electrical Enclosures

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Model: SS50

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

$0.70
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SEPCO SS50 Series Zinc-Plated Steel Flat Knockout Seal for Electrical Enclosures

The SEPCO SS50 Series Flat Knockout Seal closes unused knockout openings in electrical panels, enclosures, junction boxes, and cabinets, restoring a clean, finished surface after conduit runs, fittings, or equipment are removed or relocated. Constructed from zinc-plated steel, this flat knockout seal resists corrosion while sitting flush against the enclosure wall for a low-profile fit, and the SS50 Series is available across 1/2" through 2" trade sizes to fit standard knockout openings. Rather than leaving an open knockout exposed, the SS50 gives electrical contractors, panel shops, and facility maintenance teams a simple, purpose-built way to keep enclosures properly closed and code-conscious.

Key Features

  • Trade Size Range: Available in 1/2", 3/4", 1", 1-1/2", and 2" sizes to fit standard electrical knockout openings.
  • Durable Construction: Zinc-plated steel base resists corrosion and holds up to everyday panel, cabinet, and enclosure environments.
  • Flat, Low-Profile Design: Sits flush against the enclosure wall for a clean, finished appearance with no protruding hardware.
  • Knockout Seal Function: Closes unused knockout openings left in electrical boxes, panels, and enclosures after conduit or fitting changes.
  • SS50 Series Designation: Identified under the SEPCO SS50 series for straightforward specification and reordering across sizes.
  • Steel Base Strength: Steel construction provides the strength needed to stay seated in the knockout opening over time.
  • Clean, Finished Appearance: Eliminates open, unsealed knockouts for a neater, more professional-looking panel or enclosure.

Technical Specifications

  • Trade Size: 1/2" - 2"

Typical Applications

  • Electrical Panels and Enclosures
  • Junction and Pull Boxes
  • Panelboards and Load Centers
  • Cabinet and Equipment Enclosures
  • Knockout Opening Closure and Finishing
  • New Construction and Renovation Projects

Why SEPCO?

SEPCO manufactures the SS50 Series Knockout Seal from zinc-plated steel, spanning 1/2" through 2" trade sizes, to give electrical professionals a dependable way to close out unused knockouts instead of leaving enclosures exposed. The flat, low-profile design and corrosion-resistant zinc plating are built to keep panels, junction boxes, and cabinets looking clean and finished over the long term. Shop SEPCO electrical hardware at ZenSupply for straightforward, reliable components that help finish installations right.

Manufacturer Resources

SEPCO Product Catalog

Product Specs

list_batch:
SEP-20260911
Product Type:
Gland Plate & Entry Seal
Product Finish:
Zinc-Plated
Series:
SS50
Department:
Electrical
Product Group:
Boxes & Enclosures
Product Subgroup:
Enclosure Accessories
Product Material:
Steel

SEPCO SS50 – Frequently Asked Questions

1) What size knockout does the SEPCO SS50 knockout seal fit?
The SS50 Series is made in five trade sizes that match standard electrical knockouts: 1/2 inch (SS50), 3/4 inch (SS52), 1 inch (SS54), 1-1/2 inch (SS58), and 2 inch (SS60). Order by the trade size of the conduit fitting that came out of the opening, not by the measured hole diameter, since a 1/2 inch trade knockout is physically larger than 1/2 inch.
2) What do you use to close an unused knockout left after a conduit is removed?
A flat knockout seal like the SEPCO SS50 is the purpose-made part. It closes the open knockout in a panel, junction box, panelboard, load center, or equipment cabinet after conduit, fittings, or gear are pulled or relocated, so the enclosure is closed back up instead of left with an open hole.
3) Will a zinc-plated steel knockout seal rust in a damp mechanical room?
The SS50 is steel with a zinc-plated finish, which is the normal corrosion protection for indoor panel, cabinet, and junction box work. For washdown, coastal, or wet outdoor enclosures, plated steel is not the material to reach for; a stainless or gasketed closure is the better call there.
4) Does the SS50 seal stick out past the enclosure wall or interfere with panel covers and gutter space?
It is a flat, low-profile seal that sits flush against the enclosure wall with no protruding hardware, so it will not fight a deadfront, a hinged cover, or wire in the gutter the way a bulkier plug can.
5) Is a flat knockout seal the right choice, or do I need a cable gland or entry seal instead?
Pick by whether anything passes through the hole. The SS50 is a closure only, it seals a knockout shut with nothing running through it. If a cable still needs to enter the enclosure at that opening, you want a gland or entry seal sized to the cable, not this part.
6) Can one SEPCO part number cover knockout closures across a whole building's panels?
Not one number, but one series. Facility and MRO buyers standardize on the SS50 Series and stock the five trade sizes (SS50, SS52, SS54, SS58, SS60) so any 1/2 inch through 2 inch knockout in the building is covered by the same zinc-plated steel part, with consistent appearance across panels.
How fast can I get the SEPCO SS50 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 SS50 come with a warranty?
Absolutely. The SEPCO SS50 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 SS50?
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 SS50 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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