Knockout Closers
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Part #TB 1451 1/2" KNOCKOUT PLUG GRAY PLASTIC T&B® 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
92 in Stock. More available 12/31/2025 and 01/02/2026
$247.30 per C (100) / EA
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
511 in Stock. More available 01/01/2026
$138.90 per C (100) / EA
Part #RACO 1040 3-1/2" HOLESEAL 2 PIECE STEEL RACO® 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
33 in Stock. More available 01/08/2026
$2425.90 per C (100) / EA
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
111 in Stock. More available 01/01/2026
$65.50 per PK (25) / EA
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
34 in Stock. More available 01/01/2026
$93.93 per PK (10) / EA
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
27 in Stock. More available 01/04/2026
$903.70 per C (100) / EA
Part #TB 1453 1" KNOCKOUT PLUG GRAY PLASTIC T&B® 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
23 in Stock. More available 01/02/2026
$549.90 per C (100) / EA
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
304 in Stock. More available 01/01/2026
$143.40 per C (100) / EA
Part #MULB 40114 1-1/4" KNOCKOUT CLOSER SNAP-IN STEEL Mulberry Knockout Seal, Closed, 1-1/4 in Size, Snap-In Mounting, Steel, Bright Zinc Plated
MFG #40114
612 in Stock. More available 01/01/2026
$83.00 per C (100) / EA
Part #MTAL 300KOS 3" (3)PIECE KNOCK-OUT SEAL Metallics Knockout Seal, 3-Piece, 3 in Hole, 3 in Conduit, For Use With: Panel Box, Steel, Silver
MFG #300KOS
14 in Stock. More available 12/22/2025 and 01/04/2026
$2755.50 per C (100) / EA
Part #RACO 1039 3" HOLESEAL (2)PIECE STEEL RACO® Knockout Seal, 2-Piece, For Use With: Box/Panelboard, 3 in Trade Size, Steel, Electro-Plated Zinc, Silver, 3-13/16 in W x 5/8 in D
MFG #1039
58 in Stock. More available 01/08/2026
$1930.00 per C (100) / EA
Part #GB KO702 3/4" HOLESEAL 50/BX Gardner Bender Knockout Seal, 3/4 in, For Use With: Unused Box Knockout, Steel, Galvanized
MFG #KO702
398 in Stock. More available 01/01/2026
$90.85 per PK (50) / EA
Part #SWCOMP H4471 4"X2" RECT BOX 1-1/2" DEEP 1/2" KO Southwire - Topaz Drawn Handy Box, (8) Side/(2) Bottom Knockouts, 1/2 in Knockout, Rectangle Shape, 11.5 cu-in Capacity, Steel, Galvanized, 2 in W x 2-1/8 in D x 4 in H Dimensions
MFG #H4471
550 in Stock. More available 01/07/2026
$697.00 per C (100) / EA
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 01/05/2026
$652.20 per C (100) / EA
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
52 in Stock. More available 01/02/2026
$77.51 per PK (10) / EA
Part #TB 5710 1/2" KNOCKOUT PLUG NEOPRENE NEMA3R -4 -6 -13 T&B® 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
71 in Stock. More available 01/02/2026
$932.10 per C (100) / EA
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
425 in Stock. More available 01/01/2026
$173.60 per C (100) / EA
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
64 in Stock. More available 01/01/2026
$84.93 per PK (25) / EA
Part #RACO 1041 4" HOLESEAL (2)PIECE STEEL RACO® 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
45 in Stock. More available 01/08/2026
$3008.00 per C (100) / EA
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
27 in Stock. More available 01/01/2026
$52.55 per PK (10) / EA
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 01/01/2026
$65.31 per PK (10) / EA
Part #TB 5711-TB 3/4" KNOCKOUT PLUG NEOPRENE NEMA3R -4 -6 -13 T&B Liquidtight Fittings, 5711-TB, Plug, 3/4 in Size, Neoprene
MFG #5711-TB
42 in Stock. More available 01/02/2026
$1272.10 per C (100) / EA
Part #SWCOMP KO50 1/2IN STEEL BOX KNOCK-OUT SEAL Southwire - Topaz Knockout Seal, 1/2 in Conduit, Steel, 1.07 in Dia x 0.37 in H
MFG #KO50
289 in Stock. More available 01/07/2026
$0.36 per EA (1) / EA
Part #RACO 1037 2-1/2" HOLESEAL (2)PIECE STEEL RACO® Knockout Seal, 2-Piece, Steel, Electro-Plated Zinc, 0.625 in L x 3.188 in W x 3.188 in H
MFG #1037
71 in Stock. More available 01/05/2026 and 01/14/2026
$1531.10 per C (100) / EA
Part #TB 1451 1/2" KNOCKOUT PLUG GRAY PLASTIC T&B® 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
92 in Stock. More available 12/31/2025 and 01/02/2026
$247.30 per C (100) / EA
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
511 in Stock. More available 01/01/2026
$138.90 per C (100) / EA
Part #RACO 1040 3-1/2" HOLESEAL 2 PIECE STEEL RACO® 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
33 in Stock. More available 01/08/2026
$2425.90 per C (100) / EA
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
111 in Stock. More available 01/01/2026
$65.50 per PK (25) / EA
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
34 in Stock. More available 01/01/2026
$93.93 per PK (10) / EA
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
27 in Stock. More available 01/04/2026
$903.70 per C (100) / EA
Part #TB 1453 1" KNOCKOUT PLUG GRAY PLASTIC T&B® 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
23 in Stock. More available 01/02/2026
$549.90 per C (100) / EA
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
304 in Stock. More available 01/01/2026
$143.40 per C (100) / EA
Part #MULB 40114 1-1/4" KNOCKOUT CLOSER SNAP-IN STEEL Mulberry Knockout Seal, Closed, 1-1/4 in Size, Snap-In Mounting, Steel, Bright Zinc Plated
MFG #40114
612 in Stock. More available 01/01/2026
$83.00 per C (100) / EA
Part #MTAL 300KOS 3" (3)PIECE KNOCK-OUT SEAL Metallics Knockout Seal, 3-Piece, 3 in Hole, 3 in Conduit, For Use With: Panel Box, Steel, Silver
MFG #300KOS
14 in Stock. More available 12/22/2025 and 01/04/2026
$2755.50 per C (100) / EA
Part #RACO 1039 3" HOLESEAL (2)PIECE STEEL RACO® Knockout Seal, 2-Piece, For Use With: Box/Panelboard, 3 in Trade Size, Steel, Electro-Plated Zinc, Silver, 3-13/16 in W x 5/8 in D
MFG #1039
58 in Stock. More available 01/08/2026
$1930.00 per C (100) / EA
Part #GB KO702 3/4" HOLESEAL 50/BX Gardner Bender Knockout Seal, 3/4 in, For Use With: Unused Box Knockout, Steel, Galvanized
MFG #KO702
398 in Stock. More available 01/01/2026
$90.85 per PK (50) / EA
Part #SWCOMP H4471 4"X2" RECT BOX 1-1/2" DEEP 1/2" KO Southwire - Topaz Drawn Handy Box, (8) Side/(2) Bottom Knockouts, 1/2 in Knockout, Rectangle Shape, 11.5 cu-in Capacity, Steel, Galvanized, 2 in W x 2-1/8 in D x 4 in H Dimensions
MFG #H4471
550 in Stock. More available 01/07/2026
$697.00 per C (100) / EA
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 01/05/2026
$652.20 per C (100) / EA
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
52 in Stock. More available 01/02/2026
$77.51 per PK (10) / EA
Part #TB 5710 1/2" KNOCKOUT PLUG NEOPRENE NEMA3R -4 -6 -13 T&B® 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
71 in Stock. More available 01/02/2026
$932.10 per C (100) / EA
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
425 in Stock. More available 01/01/2026
$173.60 per C (100) / EA
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
64 in Stock. More available 01/01/2026
$84.93 per PK (25) / EA
Part #RACO 1041 4" HOLESEAL (2)PIECE STEEL RACO® 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
45 in Stock. More available 01/08/2026
$3008.00 per C (100) / EA
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
27 in Stock. More available 01/01/2026
$52.55 per PK (10) / EA
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 01/01/2026
$65.31 per PK (10) / EA
Part #TB 5711-TB 3/4" KNOCKOUT PLUG NEOPRENE NEMA3R -4 -6 -13 T&B Liquidtight Fittings, 5711-TB, Plug, 3/4 in Size, Neoprene
MFG #5711-TB
42 in Stock. More available 01/02/2026
$1272.10 per C (100) / EA
Part #SWCOMP KO50 1/2IN STEEL BOX KNOCK-OUT SEAL Southwire - Topaz Knockout Seal, 1/2 in Conduit, Steel, 1.07 in Dia x 0.37 in H
MFG #KO50
289 in Stock. More available 01/07/2026
$0.36 per EA (1) / EA
Part #RACO 1037 2-1/2" HOLESEAL (2)PIECE STEEL RACO® Knockout Seal, 2-Piece, Steel, Electro-Plated Zinc, 0.625 in L x 3.188 in W x 3.188 in H
MFG #1037
71 in Stock. More available 01/05/2026 and 01/14/2026
$1531.10 per C (100) / EA