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
330 in Stock. More available 03/27/2026
$2.05/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
464 in Stock. More available 04/02/2026
$1.52/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
30 in Stock. More available 04/05/2026
$19.05/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
122 in Stock. More available 04/02/2026
$2.87/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
36 in Stock. More available 03/18/2026 and 04/02/2026
$10.17/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
38 in Stock. More available 04/05/2026
$8.02/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 03/27/2026
$4.49/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
361 in Stock. More available 03/17/2026 and 03/30/2026
$1.23/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
366 in Stock. More available 03/30/2026
$0.70/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
19 in Stock. More available 04/05/2026
$24.44/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
50 in Stock. More available 03/27/2026 and 04/05/2026
$15.16/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
209 in Stock. More available 04/02/2026
$2.00/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 04/06/2026
$6.92/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
14 in Stock. More available 04/06/2026
$5.79/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
21 in Stock. More available 03/18/2026 and 04/03/2026
$8.31/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 03/27/2026
$7.82/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
494 in Stock. More available 03/17/2026 and 03/30/2026
$1.47/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
49 in Stock. More available 04/02/2026
$3.68/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
47 in Stock. More available 04/05/2026
$23.63/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
33 in Stock. More available 04/02/2026
$5.78/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
73 in Stock. More available 04/02/2026
$6.99/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
92 in Stock. More available 03/27/2026
$10.67/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
278 in Stock. More available 04/05/2026
$0.36/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
87 in Stock. More available 04/10/2026
$12.03/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
330 in Stock. More available 03/27/2026
$2.05/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
464 in Stock. More available 04/02/2026
$1.52/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
30 in Stock. More available 04/05/2026
$19.05/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
122 in Stock. More available 04/02/2026
$2.87/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
36 in Stock. More available 03/18/2026 and 04/02/2026
$10.17/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
38 in Stock. More available 04/05/2026
$8.02/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 03/27/2026
$4.49/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
361 in Stock. More available 03/17/2026 and 03/30/2026
$1.23/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
366 in Stock. More available 03/30/2026
$0.70/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
19 in Stock. More available 04/05/2026
$24.44/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
50 in Stock. More available 03/27/2026 and 04/05/2026
$15.16/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
209 in Stock. More available 04/02/2026
$2.00/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 04/06/2026
$6.92/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
14 in Stock. More available 04/06/2026
$5.79/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
21 in Stock. More available 03/18/2026 and 04/03/2026
$8.31/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 03/27/2026
$7.82/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
494 in Stock. More available 03/17/2026 and 03/30/2026
$1.47/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
49 in Stock. More available 04/02/2026
$3.68/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
47 in Stock. More available 04/05/2026
$23.63/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
33 in Stock. More available 04/02/2026
$5.78/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
73 in Stock. More available 04/02/2026
$6.99/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
92 in Stock. More available 03/27/2026
$10.67/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
278 in Stock. More available 04/05/2026
$0.36/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
87 in Stock. More available 04/10/2026
$12.03/EA