Knockout Closers
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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
33 in Stock. More available 05/17/2026
$9.58/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
181 in Stock. More available 05/14/2026
$2.04/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
13 in Stock. More available 05/17/2026
$29.21/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
37 in Stock. More available 05/14/2026
$3.82/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
204 in Stock. More available 05/15/2026
$2.81/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
691 in Stock. More available 05/14/2026
$1.56/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 05/23/2026
$25.47/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
148 in Stock. More available 05/14/2026
$2.95/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
55 in Stock. More available 05/14/2026
$10.56/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
10 in Stock. More available 05/15/2026
$6.24/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 05/18/2026
$6.92/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
27 in Stock. More available 05/15/2026
$8.72/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
56 in Stock. More available 05/15/2026
$10.57/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
422.391 in Stock. More available 05/04/2026 and 05/25/2026
$1.74/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
56 in Stock. More available 05/24/2026
$31.58/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
28 in Stock. More available 05/14/2026
$5.91/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
52 in Stock. More available 05/14/2026
$7.33/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
142 in Stock. More available 05/04/2026 and 05/15/2026
$14.43/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 05/19/2026
$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
78 in Stock. More available 05/28/2026
$16.08/EA
Part #GB KO710 4" HOLESEAL 10/BX Gardner Bender, KO710, Knockout Seal, Bolt-On, 4 in Hole, 4 in Conduit, For Use With: Box, Steel, Galvanized, Silver
MFG #KO710
17 in Stock. More available 05/14/2026
$16.07/EA
Part #TB 1452 3/4" KNOCKOUT PLUG GRAY PLASTIC T&B® Industrial Fitting Knockout Locking Plug, Non-Metallic, 3/4 in Size, For Use With: Rigid/IMC Conduit, Snap-In Mounting, Thermoplastic, 1.3 in Dia Dimensions
MFG #1452
382 in Stock. More available 05/15/2026
$3.32/EA
Part #MULB 40112 3/4" KNOCKOUT CLOSER SNAP-IN STEEL Mulberry Knockout Seal, Closed, 3/4 in Size, Snap-In Mounting, Steel, Bright Zinc Plated
MFG #40112
2782 in Stock. More available 05/25/2026
$0.42/EA
Part #SWCOMP KO51 3/4IN STEEL BOX KNOCK-OUT SEAL Southwire - Topaz Knockout Seal, 3/4 in Conduit, Steel, 1.24 in Dia x 0.31 in H
MFG #KO51
345 in Stock. More available 05/19/2026
$0.46/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
33 in Stock. More available 05/17/2026
$9.58/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
181 in Stock. More available 05/14/2026
$2.04/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
13 in Stock. More available 05/17/2026
$29.21/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
37 in Stock. More available 05/14/2026
$3.82/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
204 in Stock. More available 05/15/2026
$2.81/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
691 in Stock. More available 05/14/2026
$1.56/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 05/23/2026
$25.47/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
148 in Stock. More available 05/14/2026
$2.95/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
55 in Stock. More available 05/14/2026
$10.56/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
10 in Stock. More available 05/15/2026
$6.24/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 05/18/2026
$6.92/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
27 in Stock. More available 05/15/2026
$8.72/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
56 in Stock. More available 05/15/2026
$10.57/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
422.391 in Stock. More available 05/04/2026 and 05/25/2026
$1.74/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
56 in Stock. More available 05/24/2026
$31.58/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
28 in Stock. More available 05/14/2026
$5.91/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
52 in Stock. More available 05/14/2026
$7.33/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
142 in Stock. More available 05/04/2026 and 05/15/2026
$14.43/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 05/19/2026
$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
78 in Stock. More available 05/28/2026
$16.08/EA
Part #GB KO710 4" HOLESEAL 10/BX Gardner Bender, KO710, Knockout Seal, Bolt-On, 4 in Hole, 4 in Conduit, For Use With: Box, Steel, Galvanized, Silver
MFG #KO710
17 in Stock. More available 05/14/2026
$16.07/EA
Part #TB 1452 3/4" KNOCKOUT PLUG GRAY PLASTIC T&B® Industrial Fitting Knockout Locking Plug, Non-Metallic, 3/4 in Size, For Use With: Rigid/IMC Conduit, Snap-In Mounting, Thermoplastic, 1.3 in Dia Dimensions
MFG #1452
382 in Stock. More available 05/15/2026
$3.32/EA
Part #MULB 40112 3/4" KNOCKOUT CLOSER SNAP-IN STEEL Mulberry Knockout Seal, Closed, 3/4 in Size, Snap-In Mounting, Steel, Bright Zinc Plated
MFG #40112
2782 in Stock. More available 05/25/2026
$0.42/EA
Part #SWCOMP KO51 3/4IN STEEL BOX KNOCK-OUT SEAL Southwire - Topaz Knockout Seal, 3/4 in Conduit, Steel, 1.24 in Dia x 0.31 in H
MFG #KO51
345 in Stock. More available 05/19/2026
$0.46/EA