Schaedler Yesco | Knockout Closers

Knockout Closers

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: In Stock
: Gardner Bender (9)
Metallics (4)
Mulberry Plates (6)
Raco Hubbell (4)
Southwire Components (3)
Thomas & Betts (5)
: TR (1)
MUL (4)
IND (2)
US (8)
CHN (1)
CN (15)
: Topaz (2)
knock out (4)
RACO (4)
: Features: The Ultimate in High Quality Safety, 3-Piece Quick-Seal to Plug Holes in Panel Boxes (4)
Features: Available in multiple KO sizes and raised ground emboss with installed 10/32 ground screw (1)
Zinc electro plated (4)
Made of flame retardant neoprene, these new knockout plugs meet U.L. 514 flammability test. (1)
One-Piece Construction Designed to Snap in Place (3)
Features: Snap-In Connection (2)
: 0.625 in x 4.906 in x 4.906 in (1)
3 IN (1)
1/2 (1)
0.625 in x 4.375 in x 4.375 in (1)
1-1/4 (1)
3/4 IN (2)
1 (1)
0.625 in x 3.188 in x 3.188 in (1)
2 (1)
3/4 (1)

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TB 1451

Part #TB 1451 1/2" KNOCKOUT PLUG GRAY PLASTIC T&BÂ® Industrial Fitting Knockout Locking Plug, Non-Metallic, 1/2 in Size, For Use With: Rigid/IMC Conduit, Snap-In Mounting, Thermoplastic, 1.06 in Dia Dimensions

MFG #1451

100 in Stock. More available 02/16/2026 and 03/05/2026

$247.30/BX

QTY

U/M

GB KO701

Part #GB KO701 1/2" HOLESEAL 100/BX KNOCKOUT SEAL Gardner Bender, KO701, Knockout Seal, Bolt-On, 1/2 in Hole, 1/2 in Conduit, For Use With: Box Knockout, Steel, Galvanized, Silver

MFG #KO701

529 in Stock. More available 03/07/2026

$138.90/BX

QTY

U/M

RACO 1040

Part #RACO 1040 3-1/2" HOLESEAL 2 PIECE STEEL RACOÂ® Knockout Seal, 2-Piece, For Use With: Box/Panelboard, 3-1/2 in Trade Size, Steel, Electro-Plated Zinc, Silver, 4-3/8 in W x 5/8 in D

MFG #1040

34 in Stock. More available 03/09/2026

$242.59/BX

Regular Price: $779.77/BX, you save $537.18 (69%)

QTY

U/M

GB KO703

Part #GB KO703 1" HOLESEAL 25/BX Gardner Bender, KO703, Knockout Seal, Bolt-On, 1 in Hole, 1 in Conduit, For Use With: Box Knockout, Steel, Galvanized, Silver

MFG #KO703

112 in Stock. More available 03/07/2026

$65.50/BX

QTY

U/M

GB KO708

Part #GB KO708 3" HOLESEAL 10/BX Gardner Bender, KO708, Knockout Seal, Bolt-On, 3 in Hole, 3 in Conduit, For Use With: Box Knockout, Steel, Galvanized, Silver

MFG #KO708

39 in Stock. More available 03/07/2026

$93.93/BX

QTY

U/M

MTAL 150KOS

Part #MTAL 150KOS 1-1/2" (3)PIECES KNOCK-OUT SEAL Metallics Knockout Seal, 3-Piece, 1-1/2 in Hole, 1-1/2 in Conduit, For Use With: Panel Box, Steel, Silver

MFG #150KOS

18 in Stock. More available 03/08/2026

$90.37/PK

QTY

U/M

TB 1453

Part #TB 1453 1" KNOCKOUT PLUG GRAY PLASTIC T&BÂ® Industrial Fitting Knockout Locking Plug, Non-Metallic, 1 in Size, For Use With: Rigid/IMC Conduit, Snap-In Mounting, Thermoplastic, 1.59 in Dia Dimensions

MFG #1453

26 in Stock. More available 03/05/2026

$274.95/BX

QTY

U/M

MTAL 75KOS

Part #MTAL 75KOS 3/4" (3)PIECE KNOCK-OUT SEAL Metallics Knockout Seal, 3-Piece, 3/4 in Hole, 3/4 in Conduit, For Use With: Panel Box, Steel, Silver

MFG #75KOS

32 in Stock. More available 03/08/2026

$65.22/BX

QTY

U/M

GB KO707

Part #GB KO707 2-1/2" HOLESEAL 10/BX Gardner Bender, KO707, Knockout Seal, Bolt-On, 2-1/2 in Hole, 2-1/2 in Conduit, For Use With: Box Knockout, Steel, Galvanized, Silver

MFG #KO707

58 in Stock. More available 03/07/2026

$77.51/BX

QTY

U/M

TB 5710

Part #TB 5710 1/2" KNOCKOUT PLUG NEOPRENE NEMA3R -4 -6 -13 T&BÂ® Industrial Fitting Liquid Tight Knockout Plug, 1/2 in Size, For Use With: Liquid Tight Flexible Metal Conduit Fitting, Snap-In Mounting, Neoprene, 1-9/32 in Dia Dimensions

MFG #5710

82 in Stock. More available 03/05/2026

$932.10/BX

QTY

U/M

MULB 40116

Part #MULB 40116 2" KNOCKOUT CLOSER SNAP IN-STEEL Mulberry Knockout Seal, Closed, 2 in Size, Snap-In Mounting, Steel, Bright Zinc Plated

MFG #40116

326 in Stock. More available 03/08/2026

$43.40/BX

Regular Price: $46.40/BX, you save $3.00 (6%)

QTY

U/M

GB KO704

Part #GB KO704 1-1/4" HOLESEAL 25/BX Gardner Bender, KO704, Knockout Seal, Bolt-On, 1-1/4 in Hole, 1-1/4 in Conduit, For Use With: Box Knockout, Steel, Galvanized, Silver

MFG #KO704

69 in Stock. More available 03/07/2026

$84.93/BX

QTY

U/M

RACO 1041

Part #RACO 1041 4" HOLESEAL (2)PIECE STEEL RACOÂ® Knockout Seal, 2-Piece, For Use With: Box/Panelboard, 4 in Trade Size, Steel, Electro-Plated Zinc, Silver, 4-29/32 in W x 5/8 in D

MFG #1041

46 in Stock. More available 03/09/2026

$300.80/BX

Regular Price: $925.36/BX, you save $624.56 (67%)

QTY

U/M

GB KO705

Part #GB KO705 1-1/2" HOLESEAL 10/BX Gardner Bender, KO705, Knockout Seal, Bolt-On, 1-1/2 in Hole, 1-1/2 in Conduit, For Use With: Box Knockout, Steel, Galvanized, Silver

MFG #KO705

28 in Stock. More available 03/07/2026

$52.55/BX

QTY

U/M

GB KO706

Part #GB KO706 2" HOLESEAL 10/BX Gardner Bender Knockout Seal, For Use With: Unused Box Knockout, 2 in OD, Steel, Galvanized

MFG #KO706

59 in Stock. More available 03/07/2026

$65.31/BX

QTY

U/M

MULB 40115

Part #MULB 40115 1-1/2" KNOCKOUT CLOSER SNAP-IN STEEL Mulberry Knockout Seal, Closed, 1-1/2 in Size, Snap-In Mounting, Steel, Bright Zinc Plated

MFG #40115

426 in Stock. More available 03/08/2026

$71.70/BX

Regular Price: $76.70/BX, you save $5.00 (7%)

QTY

U/M