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Knockout Filler · 2-1/2 in steel snap-in for unused enclosure openings · Nesco KO250
SKU: NES-KO250
Nesco KO250 is a 2-1/2 in knockout seal for closing unused panel and enclosure openings. Commonly used to help limit dust and debris entry in indoor electrical equipment; suitability for wet or vapour-tight locations should be confirmed against the exact seal type and listing.
What this product is for
This knockout seal is used to close an unused 2-1/2 in panel or enclosure opening. It is intended for electricians and maintenance teams working on panelboards, cabinets, boxes, and similar electrical enclosures.
Use for
Use for sealing an unused 2-1/2 in trade-size knockout in electrical panels, cabinets, and enclosures. It is commonly selected during retrofits, service work, and panel modifications where an opening must be closed after conduit rerouting or equipment changes.
Avoid for
Avoid using this item where a vapour-tight or gasketed seal is specifically required unless the exact product listing confirms that rating. Also avoid using it as a substitute for a closure that must provide bonding, environmental sealing, or tamper resistance beyond a standard knockout seal.
Best for
Best for commercial, industrial, and institutional electrical work where unused knockouts need a clean closure and basic enclosure protection. It is a practical choice when matching the opening size is the main buying requirement.
Installed in
Typically installed in panelboards, wireways, junction boxes, cabinets, and equipment enclosures with a 2-1/2 in opening. 2-1/2 in is approximately 63.5 mm.
Why this product exists
Unused knockouts leave openings that can allow dust, debris, and incidental contact into electrical equipment. A knockout seal closes that opening and helps maintain a neater, safer finished installation.
Compared with similar products
Compared with plastic snap-in knockout closures, a metal knockout seal is typically chosen for larger openings and panel work where a more secure mechanical closure is preferred. If the application needs added environmental sealing, a vapour-tight version with neoprene backing is typically selected instead. Actual performance depends on enclosure design, installation method, and local electrical code.
Specifications
- Brand: Nesco
- Manufacturer part number: KO250
- Product type: Knockout seal / knockout filler
- Nominal opening size: 2-1/2 in (63.5 mm)
- Application: Close unused knockout openings in electrical panels and enclosures
- Category: Electrical panel accessory
- Trade note: Confirm standard, vapour-tight, and material requirements before ordering for washdown or damp-location work
- ApplicationClose unused knockout openings in electrical panels and enclosures
- CategoryElectrical panel accessory
- Trade NoteConfirm standard, vapour-tight, and material requirements before ordering f
- BrandsNesco
- Stock in Elmira3
- Stock in Flesherton7
Aptico Supply Delivery
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Aptico Supply helps electricians, contractors, and commercial buyers get the electrical materials they need without unnecessary delays. Whether you are ordering for a jobsite, restocking service inventory, or arranging pickup, our delivery options are designed to keep work moving.
Free Daily Delivery
Free daily delivery is available for larger contractor accounts.
- Order by 9:00 AM for morning delivery
- Order by 2:00 PM for afternoon delivery
- Available in qualifying local delivery areas
Free Weekly Delivery
Free weekly delivery is available for smaller accounts in select service areas.
- Elmira area delivery: Tuesday
- Flesherton area delivery: Thursday
- Order by 11:00 AM on the route day
Pickup Options
Pickup is available from our Ontario locations for customers who prefer to collect their order directly.
- Elmira pickup available
- Flesherton pickup available
- Call ahead for large or special-order items
Local Delivery Areas
See our local delivery coverage below. Delivery charges may apply outside regular route areas or for oversized items.
Delivery Questions
Do you offer free delivery?
Yes, free delivery is available for qualifying contractor accounts and selected local delivery routes.
Can I pick up my order?
Yes, pickup is available from our Elmira and Flesherton locations.
Do delivery charges apply?
Delivery charges may apply outside regular local routes, for smaller orders, or for oversized and heavy items.
Can you deliver to jobsites?
Yes, jobsite delivery may be available depending on the order size, location, and delivery schedule.
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