Knockout Seals & Plugs

We carry a complete selection of knockout seals to fit any size electrical enclosure box. Whether your project requires weatherproof knockout seals or interior-rated plugs, we have a product that fits the bill. In sizes ranging from 1/2 inch to 4 inches, we stock knockout seals and plugs constructed of zinc, steel, plastic and neoprene to fit most plastic, fiberglass and metal enclosures. Shop knock out seals from Arlington Industries, Cully/Mineralac, Eaton/Crouse Hinds, Mulbery Metal Products, and Thomas & Betts. View our complete selection of knockout plugs online or stop by one of our local stores to speak to an expert.

40 Products found of 4
Product image for Mulberry 40112 3/4" Closed Knockout Seal, Bright Zinc Plated Steel
Mulberry 40112 3/4" Closed Knockout Seal, Bright Zinc Plated Steel
Manufacturer: Mulbery Metal Products
Catalog #: 40112
Capital Electric Part #: 96563
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$43.67/c (100 ea)
Product image for Mulberry 40111 1/2" Closed Knockout Seal, Bright Zinc Plated Steel
Mulberry 40111 1/2" Closed Knockout Seal, Bright Zinc Plated Steel
Manufacturer: Mulbery Metal Products
Catalog #: 40111
Capital Electric Part #: 96481
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$41.65/c (100 ea)
Product image for Arlington 901 3/4" Snap-In Blank, Steel
Arlington 901 3/4" Snap-In Blank, Steel
Manufacturer: Arlington Industries
Catalog #: 901
Capital Electric Part #: 24737
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$81.01/c (100 ea)
ea
Product image for Arlington 900 1/2" Snap-In Blank, Steel
Arlington 900 1/2" Snap-In Blank, Steel
Manufacturer: Arlington Industries
Catalog #: 900
Capital Electric Part #: 31828
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$64.89/c (100 ea)
Product image for Mulberry 40116 2" Closed Knockout Seal, Bright Zinc Plated Steel
Mulberry 40116 2" Closed Knockout Seal, Bright Zinc Plated Steel
Manufacturer: Mulbery Metal Products
Catalog #: 40116
Capital Electric Part #: 97242
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$189.60/c (100 ea)
Product image for Mulberry 40115 1-1/2" Closed Knockout Seal, Bright Zinc Plated Steel
Mulberry 40115 1-1/2" Closed Knockout Seal, Bright Zinc Plated Steel
Manufacturer: Mulbery Metal Products
Catalog #: 40115
Capital Electric Part #: 97108
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$156.67/c (100 ea)
ea
Product image for Arlington 902 1" Snap-In Blank, Steel
Arlington 902 1" Snap-In Blank, Steel
Manufacturer: Arlington Industries
Catalog #: 902
Capital Electric Part #: 6026
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$145.54/c (100 ea)
ea
Product image for Mulberry 40114 1-1/4" Closed Knockout Seal, Bright Zinc Plated Steel
Mulberry 40114 1-1/4" Closed Knockout Seal, Bright Zinc Plated Steel
Manufacturer: Mulbery Metal Products
Catalog #: 40114
Capital Electric Part #: 96963
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$90.70/c (100 ea)
ea
Product image for Mulberry 40113 1" Closed Knockout Seal, Bright Zinc Plated Steel
Mulberry 40113 1" Closed Knockout Seal, Bright Zinc Plated Steel
Manufacturer: Mulbery Metal Products
Catalog #: 40113
Capital Electric Part #: 96660
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$74.19/c (100 ea)
ea
Product image for Cully 90060 2" 3pc Knock-Out Seal, Zinc-Plated
Cully 90060 2" 3pc Knock-Out Seal, Zinc-Plated
Manufacturer: Cully / Minerallac
Catalog #: 90060
Capital Electric Part #: 89726
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$1,025.35/c (100 ea)
ea
Product image for Arlington NM900 1/2" Plastic Knockout Seal
Arlington NM900 1/2" Plastic Knockout Seal
Manufacturer: Arlington Industries
Catalog #: NM900
Capital Electric Part #: 7938
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$38.76/c (100 ea)
Product image for Cully 90064 3" 3pc Knock-Out Seal, Zinc-Plated
Cully 90064 3" 3pc Knock-Out Seal, Zinc-Plated
Manufacturer: Cully / Minerallac
Catalog #: 90064
Capital Electric Part #: 90680
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$1,597.13/c (100 ea)
ea
40 Products found of 4
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