McMaster-Carr logo
    Filter by
    Outlet Box Designation
    Industrial Info Compare
    Knockout Trade Size
    Industrial Info Compare
    Outlet Box Component
    Number of Knockouts
    Number of Outlets
    For Maximum Number of Devices
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    DFARS Specialty Metals
    For Conduit Material
    For Number of Toggle Switches
    Cover Style
    Conduit Type
    Industrial Info Compare
    Forward
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Print
    How can we improve?
    Comments
    E-mail address (if you would like a response)
    50 Products

    Extenders with Knockouts for Steel Outlet Boxes

    Add depth to your outlet box.
    Square
    Image of Product. Front orientation. Outlet Box Extenders. Extenders with Knockouts for Steel Outlet Boxes, Square.
    Outlet Box
    Designation
    No. of
    Knockouts
    Knockout
    Trade Size
    Ht.
    Wd.
    Dp.
    Cap., cu.
    in.
    Material
    Certification
    Each
    2 Gang
    		121/2, 3/4
    		4"4"1 1/2"22.5Zinc-Plated SteelUL Listed
    		0000000000000
    2 Gang
    		121/2, 3/4
    		4 11/16"4 11/16"1 1/2"29.5Zinc-Plated SteelUL Listed
    		00000000000000
    Outlet Box Covers
    Image of Product. Front orientation. Outlet Box Covers. Extenders with Knockouts for Steel Outlet Boxes, Square, Flat Blank Covers with Knockouts.
    Image of Product. Front orientation. Outlet Box Covers. Extenders with Knockouts for Steel Outlet Boxes, Square, Flat Blank Covers.
    Image of Product. Front orientation. Outlet Box Covers. Extenders with Knockouts for Steel Outlet Boxes, Square, Raised Blank Covers.
    Image of Product. Front orientation. Outlet Box Covers. Extenders with Knockouts for Steel Outlet Boxes, Square, Raised Covers for NEMA Outlets.
    Image of Product. Front orientation. Outlet Box Covers. Extenders with Knockouts for Steel Outlet Boxes, Square, Raised Covers for Toggle Switches.
    Image of Product. Front orientation. Outlet Box Covers. Extenders with Knockouts for Steel Outlet Boxes, Square, Raised Covers for Circular Outlets.

    Flat Blank

    Covers with

    Knockouts

    Flat Blank

    Covers

    Raised Blank

    Covers

    Raised Covers

    for NEMA

    Outlets

    Raised Covers

    for Toggle

    Switches

    Raised Covers

    for Circular

    Outlets

    Image of Product. Front orientation. Outlet Box Covers. Extenders with Knockouts for Steel Outlet Boxes, Square, Raised Covers for GFCI Outlets.
    Image of Product. Front orientation. Outlet Box Covers. Extenders with Knockouts for Steel Outlet Boxes, Square, Raised Covers for NEMA and GFCI Outlets.
    Image of Product. Front orientation. Outlet Box Covers. Extenders with Knockouts for Steel Outlet Boxes, Square, Raised Covers for NEMA Outlets and Toggle Switches.
    Image of Product. Front orientation. Outlet Box Covers. Extenders with Knockouts for Steel Outlet Boxes, Square, Raised Covers for NEMA and Circular Outlets.
    Image of Product. Front orientation. Outlet Box Covers. Extenders with Knockouts for Steel Outlet Boxes, Square, Raised Covers for NEMA Outlets, GFCI Outlets, and Toggle Switches.

    Raised Covers

    for GFCI

    Outlets

    Raised Covers

    for NEMA and

    GFCI Outlets

    Raised Covers

    for NEMA

    Outlets and

    Toggle

    Switches

    Raised Covers

    for NEMA and

    Circular

    Outlets

    Raised Covers

    for NEMA

    Outlets, GFCI

    Outlets, and

    Toggle Switches

    For Max. No.
    of Devices
    Outlet Box
    Designation
    For No. of Outlets
    Circular
    Outlet Dia.
    For No. of Toggle
    Switches
    Knockout Trade Size (No.
    of Knockouts)
    Ht.
    Wd.
    Dp.
    Material
    Mounting Fasteners
    Included
    Certification
    Each
    Flat Blank Covers with Knockouts
    02 Gang———1/2 (1)4"4"—Zinc-Plated SteelNoUL Listed0000000000000
    02 Gang———1/2 (1)4 11/16"4 11/16"—Zinc-Plated SteelNoUL Listed000000000000
     
    Flat Blank Covers
    02 Gang————4"4"—Zinc-Plated SteelNoUL Listed000000000000
    02 Gang————4 11/16"4 11/16"—Zinc-Plated SteelNoUL Listed, C-UL Listed0000000000000
     
    Raised Blank Covers
    02 Gang————4 1/8"4 1/8"9/16"Zinc-Plated SteelNoUL Listed0000000000000
     
    Raised Covers for NEMA Outlets
    12 Gang2 Outlets———4 1/8"4 1/8"9/16"Zinc-Plated SteelYesUL Listed000000000000
    22 Gang4 Outlets———4 1/8"4 1/8"9/16"Zinc-Plated SteelYesUL Listed000000000000
     
    Raised Covers for Toggle Switches
    12 Gang——1—4 1/8"4 1/8"9/16"Zinc-Plated SteelYesUL Listed000000000000
    22 Gang——2—4 1/8"4 1/8"9/16"Zinc-Plated SteelYesUL Listed000000000000
     
    Raised Covers for Circular Outlets
    12 Gang1 Outlet1.4"——4 1/8"4 1/8"9/16"Zinc-Plated SteelYesUL Listed000000000000
    12 Gang1 Outlet1.6"——4 1/8"4 1/8"9/16"Zinc-Plated SteelYesUL Listed000000000000
    12 Gang1 Outlet1.7"——4 1/8"4 1/8"9/16"Zinc-Plated SteelYesUL Listed000000000000
    12 Gang1 Outlet2.1"——4 1/8"4 1/8"9/16"Zinc-Plated SteelYesUL Listed000000000000
    12 Gang1 Outlet2.6"——4 1/8"4 1/8"9/16"Zinc-Plated SteelYesUL Listed000000000000
     
    Raised Covers for GFCI Outlets
    12 Gang1 Outlet———4 1/8"4 1/8"9/16"Zinc-Plated SteelYesUL Listed000000000000
    22 Gang2 Outlets———4 1/8"4 1/8"9/16"Zinc-Plated SteelYesUL Listed0000000000000
     
    Raised Covers for NEMA and GFCI Outlets
    22 Gang2 NEMA Outlets, 1 GCFI Outlet———4 1/8"4 1/8"9/16"Zinc-Plated SteelYesUL Listed000000000000
     
    Raised Covers for NEMA Outlets and Toggle Switches
    22 Gang2 NEMA Outlets—1—4 1/8"4 1/8"9/16"Zinc-Plated SteelYesUL Listed000000000000
     
    Raised Covers for NEMA and Circular Outlets
    22 Gang2 NEMA Outlets, 1 Circular Outlet1.6"——4 1/8"4 1/8"9/16"Zinc-Plated SteelYesUL Listed00000000000000
     
    Raised Covers for NEMA Outlets, GFCI Outlets, and Toggle Switches
    12 Gang2 NEMA Outlets, 1 GCFI Outlet—1—4 1/16"4 1/16"1/2"Zinc-Plated SteelNoUL Listed000000000000
    12 Gang2 NEMA Outlets, 1 GCFI Outlet—1—4 1/16"4 1/16"5/8"Zinc-Plated SteelNoUL Listed000000000000
    12 Gang2 NEMA Outlets, 1 GCFI Outlet—1—4 3/4"4 3/4"1/2"Zinc-Plated SteelNoUL Listed000000000000
    12 Gang2 NEMA Outlets, 1 GCFI Outlet—1—4 3/4"4 3/4"5/8"Zinc-Plated SteelNoUL Listed000000000000
    22 Gang4 NEMA Outlets, 2 GCFI Outlets—2—4 1/16"4 1/16"1/2"Zinc-Plated SteelNoUL Listed000000000000
    22 Gang4 NEMA Outlets, 2 GCFI Outlets—2—4 1/16"4 1/16"5/8"Zinc-Plated SteelNoUL Listed000000000000
    22 Gang4 NEMA Outlets, 2 GCFI Outlets—2—4 3/4"4 3/4"1/2"Zinc-Plated SteelNoUL Listed000000000000
    22 Gang4 NEMA Outlets, 2 GCFI Outlets—2—4 3/4"4 3/4"5/8"Zinc-Plated SteelNoUL Listed000000000000
     
    Octagon
    Image of Product. Front orientation. Outlet Box Extenders. Extenders with Knockouts for Steel Outlet Boxes, Octagon.
    No. of
    Knockouts
    Knockout
    Trade Size
    Ht.
    Wd.
    Dp.
    Cap., cu.
    in.
    Material
    Certification
    Each
    41/2
    		4"4"1 1/2"15.5Zinc-Plated SteelUL Listed
    		0000000000000
    Outlet Box Covers
    Image of Product. Front orientation. Outlet Box Covers. Extenders with Knockouts for Steel Outlet Boxes, Octagon, Flat Blank Covers with Knockouts.
    Image of Product. Front orientation. Outlet Box Covers. Extenders with Knockouts for Steel Outlet Boxes, Octagon, Flat Blank Covers.
    Image of Product. Front orientation. Outlet Box Covers. Extenders with Knockouts for Steel Outlet Boxes, Octagon, Flat Covers for NEMA Outlets.

    Flat Blank

    Covers with

    Knockouts

    Flat Blank

    Covers

    Flat Covers for

    NEMA Outlets

    For Max. No.
    of Devices
    For No. of
    Outlets
    Knockout Trade Size (No.
    of Knockouts)
    Ht.
    Wd.
    Material
    Mounting Fasteners
    Included
    Certification
    Each
    Flat Blank Covers with Knockouts
    0—1/2 (1)4"4"Zinc-Plated SteelNoUL Listed0000000000000
     
    Flat Blank Covers
    0——4"4"Zinc-Plated SteelNoUL Listed000000000000
     
    Flat Covers for NEMA Outlets
    12 Outlets—4"4"Zinc-Plated SteelNoUL Listed000000000000
     

    Extenders for Weatherproof Outlet Boxes

    Add depth to your weatherproof outlet box. Exposure to rain, snow, and wet conditions won’t damage these corrosion-resistant extenders.
    Rectangle
    Image of Product. Front orientation. Outlet Box Extenders. Extenders for Weatherproof Outlet Boxes, Rectangle.
    Outlet Box
    Designation
    Ht.
    Wd.
    Dp.
    Cap., cu.
    in.
    Material
    Mounting Fasteners
    Included
    Enclosure
    Rating
    Certification
    Each
    1 Gang
    		4 1/2"2 3/4"1"9.5Gray Powder-Coated AluminumYesNEMA 3R
    		UL Listed, CSA Certified
    		000000000000
    Outlet Box Covers
    Image of Product. Front orientation. Outlet Box Covers. Extenders for Weatherproof Outlet Boxes, Rectangle, Raised Blank Covers.
    Image of Product. Front orientation. Outlet Box Covers. Extenders for Weatherproof Outlet Boxes, Rectangle, Raised Covers with 3 Conduit Connections.
    Image of Product. Front orientation. Outlet Box Covers. Extenders for Weatherproof Outlet Boxes, Rectangle, Raised Covers for Toggle Switches.

    Raised

    Blank

    Covers

    Raised

    Covers with

    3 Conduit

    Connections

    Raised

    Covers for

    Toggle

    Switches

    For Max. No.
    of Devices
    Outlet Box
    Designation
    Conduit
    Trade Size
    Conduit
    Connection
    Conduit Thread
    Type
    For No. of Toggle
    Switches
    Ht.
    Wd.
    Material
    Mounting Fasteners
    Included
    Enclosure
    Rating
    Certification
    Each
    Raised Blank Covers
    01 Gang————4 9/16"2 13/16"Gray Powder-Coated SteelYesNEMA 3RUL Listed00000000000
     
    Raised Covers with 3 Conduit Connections
    31 Gang1/2ThreadedNPT—4 9/16"2 13/16"Gray Powder-Coated AluminumYesNEMA 3RUL Listed0000000000
     
    Raised Covers for Toggle Switches
    11 Gang———14 9/16"2 13/16"Gray Powder-Coated AluminumYes—UL Listed00000000000
     
    Round
    Image of Product. Front orientation. Outlet Box Extenders. Extenders for Weatherproof Outlet Boxes, Round.
    Sealing Plugs—Outlet box extenders come with sealing plugs for unused connections.
    No. of Conduit
    Connections
    Conduit
    Trade Size
    Conduit
    Connection
    For Conduit
    Type
    For Conduit Material
    Dia.
    Dp.
    Cap., cu.
    in.
    Material
    Mounting Fasteners
    Included
    Includes
    Enclosure
    Rating
    Certification
    Each
    41/2
    		ThreadedIMC, RMC
    		Aluminum, Stainless Steel, Steel4"1 1/2"16.3Gray Powder-Coated AluminumYesSealing PlugsNEMA 3R
    		UL Listed, CSA Certified
    		0000000000000
    Outlet Box Covers
    Image of Product. Front orientation. Outlet Box Covers. Extenders for Weatherproof Outlet Boxes, Round, Flat Blank Covers.
    Image of Product. Front orientation. Outlet Box Covers. Extenders for Weatherproof Outlet Boxes, Round, Raised Covers with 1 Conduit Connection.
    Image of Product. Front orientation. Outlet Box Covers. Extenders for Weatherproof Outlet Boxes, Round, Raised Covers with 3 Conduit Connections.

    Flat Blank Covers

    Raised Covers

    with 1 Conduit

    Connection

    Raised Covers

    with 3 Conduit

    Connections

    For Max. No.
    of Devices
    Conduit
    Trade Size
    Conduit
    Connection
    Conduit Thread
    Type
    Dia.
    Material
    Mounting Fasteners
    Included
    Enclosure
    Rating
    Certification
    Each
    Flat Blank Covers
    0———4 1/8"Gray Powder-Coated SteelYesNEMA 3RUL Listed, CSA Certified000000000000
     
    Raised Covers with 1 Conduit Connection
    11/2ThreadedNPT4 1/8"Gray Powder-Coated AluminumYesNEMA 3RUL Listed, CSA Certified00000000000
     
    Raised Covers with 3 Conduit Connections
    31/2ThreadedNPT4 1/8"Gray Powder-Coated AluminumYesNEMA 3RUL Listed, CSA Certified0000000000
     

    Extenders with Knockouts for Steel Switch Boxes

    Add depth to your switch box.
    Rectangle
    Image of Product. Front orientation. Outlet Box Extenders. Extenders with Knockouts for Steel Switch Boxes.
    Outlet Box
    Designation
    No. of
    Knockouts
    Knockout
    Trade Size
    Ht.
    Wd.
    Dp.
    Cap., cu.
    in.
    Material
    Certification
    Each
    1 Gang
    		81/2
    		4"2"1 7/8"13Zinc-Plated SteelUL Listed, C-UL Listed
    		0000000000000
    1 Gang
    		81/2
    		4"2 1/8"1 1/2"11.5Zinc-Plated SteelUL Listed
    		000000000000
    Outlet Box Covers
    Image of Product. Front orientation. Outlet Box Covers. Extenders with Knockouts for Steel Switch Boxes, Rectangle, Raised Blank Covers with Knockouts.
    Image of Product. Front orientation. Outlet Box Covers. Extenders with Knockouts for Steel Switch Boxes, Rectangle, Raised Blank Covers.
    Image of Product. Front orientation. Outlet Box Covers. Extenders with Knockouts for Steel Switch Boxes, Rectangle, Raised Covers for NEMA Outlets.
    Image of Product. Front orientation. Outlet Box Covers. Extenders with Knockouts for Steel Switch Boxes, Rectangle, Raised Covers for Toggle Switches.
    Image of Product. Front orientation. Outlet Box Covers. Extenders with Knockouts for Steel Switch Boxes, Rectangle, Raised Covers for Circular Outlets.
    Image of Product. Front orientation. Outlet Box Covers. Extenders with Knockouts for Steel Switch Boxes, Rectangle, Raised Covers for GFCI Outlets.

    Raised

    Blank

    Covers

    with

    Knockouts

    Raised

    Blank

    Covers

    Raised

    Covers

    for NEMA

    Outlets

    Raised

    Covers

    for

    Toggle

    Switches

    Raised

    Covers

    for

    Circular

    Outlets

    Raised

    Covers for

    GFCI

    Outlets

    For Max. No.
    of Devices
    Outlet Box
    Designation
    For No. of
    Outlets
    Circular
    Outlet Dia.
    For No. of Toggle
    Switches
    Knockout Trade Size (No.
    of Knockouts)
    Ht.
    Wd.
    Dp.
    Material
    Mounting Fasteners
    Included
    Certification
    Each
    Raised Blank Covers with Knockouts
    01 Gang———1/2 (1)4 3/16"2 5/16"—Zinc-Plated SteelYesUL Listed0000000000000
     
    Raised Blank Covers
    01 Gang————4 3/16"2 5/16"—Zinc-Plated SteelYesUL Listed000000000000
     
    Raised Covers for NEMA Outlets
    11 Gang2 Outlets———4 3/16"2 5/16"—Zinc-Plated SteelYesUL Listed000000000000
     
    Raised Covers for Toggle Switches
    11 Gang——1—4 3/16"2 5/16"—Zinc-Plated SteelYesUL Listed000000000000
     
    Raised Covers for Circular Outlets
    11 Gang1 Outlet1.4"——4 3/16"2 5/16"1/4"Zinc-Plated SteelYesUL Listed0000000000000
    11 Gang1 Outlet1.6"——4 3/16"2 5/16"1/4"Zinc-Plated SteelYesUL Listed0000000000000
     
    Raised Covers for GFCI Outlets
    11 Gang1 Outlet———4"2"1/2"Zinc-Plated SteelYesUL Listed, C-UL Listed000000000000
     

    Blank Covers for Steel Outlet Boxes

    Close off unused outlets.
    Flat Covers
    Image of Product. Front orientation. Outlet Box Covers. Blank Covers for Steel Outlet Boxes, Flat Covers, Square.
    Image of Product. Front orientation. Outlet Box Covers. Blank Covers for Steel Outlet Boxes, Flat Covers, Octagon.

    Square

    Octagon

    Outlet Box
    Designation
    Ht.
    Wd.
    Material
    Mounting Fasteners
    Included
    Certification
    Each
    Square
    2 Gang
    		4"4"Zinc-Plated SteelNoUL Listed
    		0000000000000
    2 Gang
    		4 11/16"4 11/16"Zinc-Plated SteelNoUL Listed, C-UL Listed
    		0000000000000
     
    Octagon
    —4"4"Zinc-Plated SteelNoUL Listed
    		000000000000
     
    Flat Covers with Knockouts
    Image of Product. Front orientation. Outlet Box Covers. Blank Covers for Steel Outlet Boxes, Flat Covers with Knockouts, Square.
    Image of Product. Front orientation. Outlet Box Covers. Blank Covers for Steel Outlet Boxes, Flat Covers with Knockouts, Octagon.

    Square

    Octagon

    Outlet Box
    Designation
    No. of
    Knockouts
    Knockout
    Trade Size
    Ht.
    Wd.
    Material
    Mounting Fasteners
    Included
    Certification
    Each
    Square
    2 Gang
    		11/2
    		4"4"Zinc-Plated SteelNoUL Listed
    		0000000000000
    2 Gang
    		11/2
    		4 11/16"4 11/16"Zinc-Plated SteelNoUL Listed
    		000000000000
     
    Octagon
    —11/2
    		4"4"Zinc-Plated SteelNoUL Listed
    		000000000000
     
    Raised Covers
    Image of Product. Front orientation. Outlet Box Covers. Blank Covers for Steel Outlet Boxes, Raised Covers.
    Outlet Box
    Designation
    Ht.
    Wd.
    Dp.
    Material
    Mounting Fasteners
    Included
    Certification
    Each
    Square
    2 Gang
    		4 1/8"4 1/8"9/16"Zinc-Plated SteelNoUL Listed
    		00000000000000
     

    Covers for Steel Outlet Boxes

    For NEMA Outlets
    Image of Product. Front orientation. Outlet Box Covers. Covers for Steel Outlet Boxes, For NEMA Outlets, Square.

    Square

    For Max. No.
    of Devices
    Outlet Box
    Designation
    For No.
    of Outlets
    Ht.
    Wd.
    Dp.
    Cover
    Style
    Material
    Mounting Fasteners
    Included
    Certification
    Each
    Square
    12 Gang
    		24 1/8"4 1/8"9/16"RaisedZinc-Plated SteelYesUL Listed
    		0000000000000
    22 Gang
    		44 1/8"4 1/8"9/16"RaisedZinc-Plated SteelYesUL Listed
    		000000000000
     
    For Toggle Switches
    Image of Product. Front orientation. Outlet Box Covers. Covers for Steel Outlet Boxes, For Toggle Switches.
    For Max. No.
    of Devices
    Outlet Box
    Designation
    For No. of Toggle
    Switches
    Ht.
    Wd.
    Dp.
    Cover
    Style
    Material
    Mounting Fasteners
    Included
    Certification
    Each
    Square
    12 Gang
    		14 1/8"4 1/8"9/16"RaisedZinc-Plated SteelYesUL Listed
    		0000000000000
    22 Gang
    		24 1/8"4 1/8"9/16"RaisedZinc-Plated SteelYesUL Listed
    		000000000000
     
    For NEMA Outlets, GFCI Outlet, and Toggle Switches
    Image of Product. Front orientation. Outlet Box Covers. Covers for Steel Outlet Boxes, For NEMA Outlets, GFCI Outlet, and Toggle Switches, Square.

    Square

    1/2" Deep
    For Max. No.
    of Devices
    Outlet Box
    Designation
    For No. of
    NEMA Outlets
    For No. of
    GFCI Outlets
    For No. of Toggle
    Switches
    Ht.
    Wd.
    Cover
    Style
    Material
    Mounting Fasteners
    Included
    Certification
    Each
    Square
    12 Gang
    		2114 1/16"4 1/16"RaisedZinc-Plated SteelNoUL Listed
    		0000000000000
    12 Gang
    		2114 3/4"4 3/4"RaisedZinc-Plated SteelNoUL Listed
    		000000000000
    22 Gang
    		4224 1/16"4 1/16"RaisedZinc-Plated SteelNoUL Listed
    		000000000000
    22 Gang
    		4224 3/4"4 3/4"RaisedZinc-Plated SteelNoUL Listed
    		000000000000
     

    Covers for Steel Switch Boxes

    For NEMA Outlets
    Image of Product. Front orientation. Outlet Box Covers. Covers for Steel Switch Boxes, For NEMA Outlets.
    For Max. No.
    of Devices
    Outlet Box
    Designation
    For No.
    of Outlets
    Ht.
    Wd.
    Cover
    Style
    Material
    Mounting Fasteners
    Included
    Certification
    Each
    Rectangle
    11 Gang
    		24 3/16"2 5/16"RaisedZinc-Plated SteelYesUL Listed
    		0000000000000
     
    For GFCI Outlets
    Image of Product. Front orientation. Outlet Box Covers. Covers for Steel Switch Boxes, For GFCI Outlets.
    For Max. No.
    of Devices
    Outlet Box
    Designation
    For No.
    of Outlets
    Ht.
    Wd.
    Dp.
    Cover
    Style
    Material
    Mounting Fasteners
    Included
    Certification
    Each
    Rectangle
    11 Gang
    		14"2"1/2"RaisedZinc-Plated SteelYesUL Listed, C-UL Listed
    		0000000000000
     
    back to top