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Knockout Seals

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

Model: MET-100KOS

Metallics Industries Knock-out Seal 1" 3-Piece Steel Zinc Quick-SealProfessional Electrical Panel Box Sealing SolutionThe Metallics Industries Knock-out Seal 1" 3-Piece Steel Zinc Quick-Seal delivers...

Metallics

$52.19

$3.35 Sale
Metallics Knock-out Seal 1/2" 3-Piece Steel Zinc Quick-Seal

Model: MET-50KOS

Metallics Industries Knock-out Seal 1/2" 3-Piece Steel Zinc Quick-SealProfessional Electrical Panel Box Sealing SolutionThe Metallics Industries Knock-out Seal 1/2" 3-Piece delivers exceptional...

Metallics

$51.36

$2.10 Sale
Metallics Knock-out Seal 2-1/2" 3-Piece Steel Zinc Quick-Seal

Model: MET-250KOS

Metallics Industries Knock-out Seal 2-1/2" 3-Piece Steel Zinc Quick-SealProfessional Electrical Panel Box Sealing SolutionThe Metallics Industries Knock-out Seal 2-1/2" delivers exceptional...

Metallics

$56.79

$11.07 Sale
Metallics Knock-out Seal 3/4" 3-Piece Steel Zinc Quick-Seal

Model: MET-75KOS

Metallics Industries Knock-out Seal 3/4" 3-Piece Steel Zinc Quick-SealProfessional Electrical Panel Box Sealing SolutionThe Metallics Industries Knock-out Seal 3/4" delivers exceptional performance...

Metallics

$51.59

$2.69 Sale
Arlington Industries All-Plastic Snap-In Knockout Bushings - Black UL/CSA Listed Professional Grade

Model: ARL-440X

Arlington Industries All-Plastic Snap-In Knockout BushingsProfessional snap-in protection for electrical knockout applicationsArlington Industries All-Plastic Snap-In Knockout Bushings deliver...

Arlington Industries

Starting at

$0.97 Sale
Arlington Industries Steel Snap-In Knockout Blanks - Zinc Plated Silver Finish

Model: ARL-90X

Arlington Industries Steel Snap-In Knockout Blanks - Zinc Plated Silver FinishProfessional knockout closure solution with durable zinc plated steel constructionArlington Industries Steel Snap-In...

Arlington Industries

Starting at

$0.72 Sale
Bridgeport Fittings Knockout Plugs - Zinc Plated Steel Electrical Enclosure Caps

Model: BPF-1691

Bridgeport Fittings Knockout Plugs - Zinc Plated Steel Electrical Enclosure CapsProfessional electrical enclosure protection and safetyBridgeport Fittings Knockout Plugs provide reliable protection...

Bridgeport Fittings

Starting at

$1.16 Sale
Crouse-Hinds 336 Rigid/IMC Knockout Snap-In Blank, Steel

Model: CRS-336

Crouse-Hinds 336 Rigid/IMC Knockout Snap-In Blank, SteelThe Crouse-Hinds 336 Rigid/IMC Knockout Snap-In Blank is a steel closure designed to seal unused knockout openings in Rigid and IMC conduit...

Crouse-Hinds

Starting at

$0.50 Sale
Crouse-Hinds Steel Knockout Snap-In Blank for Rigid/IMC Conduit Systems

Model: CRS-RMC-KOB-ST

Crouse-Hinds Steel Knockout Snap-In Blank for Rigid/IMC Conduit SystemsProfessional conduit system sealing solutionThe Crouse-Hinds Steel Knockout Snap-In Blank provides reliable sealing for unused...

Crouse-Hinds

Starting at

$0.99 Sale
Metallics 1001KOSGSS 1 K-O Seal & Gasket USA 316 SS

Model: MET-1001KOSGSS

1 K-O Seal & Gasket USA 316 SS

Metallics

$67.76

$23.14 Sale
Metallics 100KOSG Seal 1 K-O Seal &Gask St-zn (10)

Model: MET-100KOSG

Seal 1 K-O Seal &Gask St-zn (10) Additional Notes other sizes and quantities available by request Features 3-Piece Quick-Seal to plug holes in panel boxes Size is Stamped on seal The ultimate in...

Metallics

$59.60

$13.50 Sale
Metallics 100SNKO Seals 1-In Snap In K-O (Bag 10)

Model: MET-100SNKO

Seals 1-In Snap In K-O (Bag 10) Additional Notes other sizes and quantities available by request

Metallics

$51.69

$1.93 Sale
Metallics 125KOSG Seal 1-1/4 K-O Seal &Gask St-zn (10)

Model: MET-125KOSG

Seal 1-1/4 K-O Seal &Gask St-zn (10) Additional Notes other sizes and quantities available by request Features 3-Piece Quick-Seal to plug holes in panel boxes Size is Stamped on seal The ultimate...

Metallics

$61.46

$15.43 Sale
Metallics 125SNKO Seals 1-1/4 Snap-In K-O St-zn (Bag 10)

Model: MET-125SNKO

Seals 1-1/4 Snap-In K-O St-zn (Bag 10) Additional Notes other sizes and quantities available by request

Metallics

$52.21

$3.86 Sale
Metallics 150SNKO Seal 1-1/2 Snap-In K-O St-zn (Bag 10)

Model: MET-150SNKO

Seal 1-1/2 Snap-In K-O St-zn (Bag 10) Additional Notes other sizes and quantities available by request

Metallics

$52.90

$3.86 Sale
Metallics 200KOSG Seal 2" K-O Seal &Gask St-zn (10)

Model: MET-200KOSG

Seal 2" K-O Seal &Gask St-zn (10)

Metallics

$68.23

$25.07 Sale
Metallics 200SNKO Seals 2 Snap-In K-O St-zn (Bag 10)

Model: MET-200SNKO

Seals 2 Snap-In K-O St-zn (Bag 10) Additional Notes other sizes and quantities available by request

Metallics

$53.24

$3.86 Sale
Metallics 250KOSG Seal 2-1/2" K-O Seal &Gask St-zn (10)

Model: MET-250KOSG

Seal 2-1/2" K-O Seal &Gask St-zn (10)

Metallics

$80.89

$42.43 Sale
Metallics 300KOSG Seal 3" K-O Seal &Gask St-zn (5)

Model: MET-300KOSG

Seal 3" K-O Seal &Gask St-zn (5)

Metallics

$90.20

$54.01 Sale
Metallics 350KOSG Seal 3-1/2" K-O Seal &Gask St-zn (5)

Model: MET-350KOSG

Seal 3-1/2" K-O Seal &Gask St-zn (5)

Metallics

$95.90

$61.73 Sale
Metallics 400KOSG Seal 4" K-O Seal &Gask St-zn (5)

Model: MET-400KOSG

Seal 4" K-O Seal &Gask St-zn (5)

Metallics

$102.24

$71.37 Sale
Metallics 50SNKO Seal 1/2" Snap In K-O (Bag 10)

Model: MET-50SNKO

Seal 1/2" Snap In K-O (Bag 10) Additional Notes other sizes and quantities available by request

Metallics

$51.01

$1.93 Sale
Metallics 75KOSG Seal 3/4" K-O Seal &Gask St-zn (10)

Model: MET-75KOSG

Seal 3/4" K-O Seal &Gask St-zn (10)

Metallics

$59.46

$13.50 Sale
Metallics 75SNKO Seals 3/4 Snap-In K-O St-zn (Bag 10)

Model: MET-75SNKO

Seals 3/4 Snap-In K-O St-zn (Bag 10) Additional Notes other sizes and quantities available by request

Metallics

$51.33

$1.93 Sale

Knockout seals for electrical boxes and enclosures - protecting against dust, moisture, and pests in commercial and residential installations. Shop Arlington Industries and Milbank, with fast shipping and expert help on knockout size, material compatibility, and NEC compliance.