Knockout Closers
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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
376 in Stock. More available 01/17/2026
$71.70/BX
Part #MTAL 50KOS 1/2" (3)PIECE KNOCK-OUT SEAL Metallics Knockout Seal, 3-Piece, 1/2 in Hole, 1/2 in Conduit, For Use With: Panel Box, Steel, Silver
MFG #50KOS
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
608 in Stock. More available 01/17/2026
$41.50/BX
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
16 in Stock. More available 01/16/2026
$137.78/PK
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 01/16/2026
$193.00/BX
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 01/16/2026
$90.85/BX
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 01/16/2026
$348.50/BX
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 01/17/2026
$65.22/BX
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 01/17/2026
$77.51/BX
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
82 in Stock. More available 01/13/2026
$932.10/BX
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
251 in Stock. More available 01/17/2026
$43.40/BX
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 01/16/2026
$84.93/BX
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
46 in Stock. More available 01/16/2026
$300.80/BX
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 01/16/2026
$52.55/BX
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 01/16/2026
$65.31/BX
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
100 in Stock. More available 12/29/2025 and 01/13/2026
$247.30/BX
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
376 in Stock. More available 01/17/2026
$71.70/BX
Part #MTAL 50KOS 1/2" (3)PIECE KNOCK-OUT SEAL Metallics Knockout Seal, 3-Piece, 1/2 in Hole, 1/2 in Conduit, For Use With: Panel Box, Steel, Silver
MFG #50KOS
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
608 in Stock. More available 01/17/2026
$41.50/BX
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
16 in Stock. More available 01/16/2026
$137.78/PK
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 01/16/2026
$193.00/BX
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 01/16/2026
$90.85/BX
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 01/16/2026
$348.50/BX
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 01/17/2026
$65.22/BX
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 01/17/2026
$77.51/BX
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
82 in Stock. More available 01/13/2026
$932.10/BX
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
251 in Stock. More available 01/17/2026
$43.40/BX
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 01/16/2026
$84.93/BX
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
46 in Stock. More available 01/16/2026
$300.80/BX
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 01/16/2026
$52.55/BX
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 01/16/2026
$65.31/BX
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
100 in Stock. More available 12/29/2025 and 01/13/2026
$247.30/BX