Windsor
Please enter a search term.
- Log In
  
  User Name
  
  Password
  
  Remember Me
  
  Forgot Password?
- Register

Home
Services and Solutions
Brands
Solutions
Services
Markets
Rewards
About Us
Careers
Log In

Please enter a search term.

Shop

Adhesives, Chemicals & Lubricants Conduit, Raceway & Strut Control & Automation Data & Communication Electric Utility & Outside Plant Products Enclosures & Boxes Fasteners & Hardwares Heat and Ventilation Lighting Office & Packaging Supplies Power Distribution Power Sources & Motors Safety Products Solar Products Switches & Wallplates Tools & Instruments

Adhesives, Chemicals & Lubricants

Adhesives

Adhesive Kits

Anti-Oxidant Joint Compound

Cement

Duct Seal Compounds

Electrical Sealing Compounds

View All

Chemicals

Anti-Seize

Bug Sprays

Cleaners & Degreasers

Corrosion Inhibitors

Freezer Sprays

View All

Cleaning Supplies

Absorbent Compounds

Absorbent Pads & Rolls

Garbage Bags & Containers

Mats

Paper Products

View All

Oils & Lubricants

Cutting/Grinding Fluids

Lubricants

Oils

Paints & Coating

Coating

Paints

Tapes & Pads

Cloth Tapes

Corrosion Protection Tapes

Double-Sided Tapes

Duct Tapes

Electrical Color Code Tapes

View All

Conduit, Raceway & Strut

Cable Tray & Accessories

Cable Tray Fittings & Accessories

Cable Tray Ladders

Cable Trays

Clamps, Hangers & Supports

Beam Clamps

Cable/Conduit Seals

Conduit Clips & Clamps

Conduit Repair Kits

Conduit Spacers

View All

Conduit & Fittings

Hazardous Location Fittings

Metallic Conduit & Fittings

Non-Metallic Conduit & Fittings

PVC Coated Conduit & Fittings

Service Entrance Fittings

Raceway Systems

Overfloor

Raceway Pre-Wired

Surface Raceway

Strut & Accessories

Angles

Double-Sided Struts

Single-Sided Struts

Strut Fittings & Accessories

Wireways, Fittings & Accessories

Wireway Fittings & Accessories

Wireways

Wire Troughs

Wiring Ducts, Fittings & Accessories

Wiring Duct Fittings & Accessories

Wiring Ducts

Extrusions

Brackets and Joining Plates

Fasteners

Hardware

Structural Extrusions

Control & Automation

Alarms & Signaling

Alarms

Beacons

Combination Light & Sound Devices

Door Holders

Door Openers

View All

Automation Control Connectivity Devices

Bridges

Control System Cable & Connector Accessories

Control System Connection Cables

Control System Passive Distribution Boxes

Control System Receptacles

View All

Drive Accessories

Brake Resistors

Drive Miscellaneous Parts & Accessories

Line and Load Reactors

Line Filters

Motor Drive Keypads & Accessories

Drives

AC Drives

DC Drives

Inverter Drives

Servo Drives

Machine Safety

Light Curtains

Safety Control Modules

Safety Switches

Motor Controls & Accessories

Contactors & Starters

Encoders

Encoders Parts & Accessories

Linear Actuators

Motor Control Parts & Accessories

View All

Passive & Active Devices

Diodes

Rectifiers

Pilot Devices

Contact Blocks

Emergency Stop Devices

Indicator Pilot Lights

Joystick Operators

Legend Plates

View All

PLCs & HMI

HMI

PLC

Software

Training & Manuals

Relay & Timers

Counters

Relays

Timers

Sensors & Switches

Sensors

Switches

Terminal Blocks & Connectors

Din Rail Terminal Blocks

Panel Mount Terminal Blocks

PCB Pluggable Connectors

PCB Terminal Blocks

Terminal Block Accessories

Signal Conditioners

RTD Signal Conditioners

Signal Isolators & Converters

Barcode & RFID

OEM Barcode Readers

RFID Readers

Data & Communication

Audio & Video Systems

A/V Distribution Amplifiers

Audio & Video System Accessories

Distribution Modules

IR Repeater Systems & Accessories

Speakers

View All

Copper Connectivity

A/V Connectors

Connector Components & Accessories

Cross-Connect System

Input/output Connectors

Modular & Ethernet Connectors

View All

Faceplates & Boxes

Accessories

Faceplates

Surface Mount Boxes

Wall Outlets

Fiber Optic Connectivity

Fiber Optic Accessories

Fiber Optic Adapter Panels

Fiber Optic Adapters

Fiber Optic Cleaning Kits

Fiber Optic Connectivity Kits

View All

Networking Hardware

Modems & Gateways

Network Interface Cards

Servers

Transceivers

Wired Networking

View All

Racks, Enclosures & Cable Management

Cable Management Panel Accessories

Cable Management Panels

Enclosure & Cabinet Accessories

Fiber Optic Enclosures

Network Cabinets

View All

Security, Video & Surveillance

Access Control Systems

Intercoms & Paging Systems

Power Supplies

Software

Two-Way Radio Accessories

Electric Utility & Outside Plant Products

Automation & Protection

Capacitors

Rods & Ties

Suspension Grips

Utility Connectors

Distribution/Transmission

Distribution

Grounding Products

Utility Elbows

Feed Thru Insert

Load Break Elbows

Utility Fuse Links

Type T Fuselink

Utility Hardware

Coupling Hardware

Guying Hardware

Mounts & Brackets

Riser & U Guard

Transmission Hardware

View All

Utility Insulators

Guy Strain Insulators

Standoff & Bus Support Insulators

Utility Poles & Supports

Pole Accessories

Pole Extensions

Utility Switches

Switches Components & Accessories

Utility Tools

Hot Stick Accessories

Hot Sticks

Lineman Grade Tools

Pole Climber's Supplies

Enclosures & Boxes

Box Hardware & Accessories

Brackets

Cover Plates

Dividers & Attachments

Gaskets

Grounding Devices & Accessories

View All

Boxes

Metallic Boxes

Non-Metallic Boxes

Weatherproof Boxes

Enclosures

Circuit Breaker Enclosures

Covers, Backplates & Accessories

Current Transformer Cabinets

Disconnect Type Enclosures

Door Stop Kits

View All

Fasteners & Hardwares

Assortment Kit

Anchor Kit

Bolt, Screw & Stud Kit

Nut & Washer Kit

Other Fastener Kit

Other Hardware Kit

Chain, Cable, Rope & Accessories

Chains

Fittings & Accessories

Ropes

Tie Wires

Cable Management Accessories

Fasteners

Bolts, Screws & Studs

Nuts & Washers

Gas Springs

Hardware

Anchors

Braces and Brackets

Caps & Plugs

Clamps

Locksets

View All

Hose Fittings

Hose Adapters

Hose Clamps

Hose Inserts

Hose Manifolds

Miscellaneous Fasteners

Ceiling Hangers

Grommets

Nails, Tacks & Pins

Rivets

Spring Steel Fasteners

View All

Power Transmission

Accessories

Belts

Sheaves

Sprockets

PVF (Pipes, Valves, Fittings)

Fittings

Pipe

Valves

Flanges

Tubing Fittings

Compression Nuts/Sleeves

Tube Fittings

Heat and Ventilation

Air Circulators

Air Conditioner Parts & Accessories

Air Conditioners

Axial Fans

Blowers, Motors & Accessories

Ceiling Fans

View All

Air Treatment

Pleated Panel Filters

Central Vacuum Systems

Central Vacuum Packages & Kits

Hoses & Accessories

Inlets & Fittings

Power Units

Tools & Attachments

View All

Controls & Thermostats

Fan Controls & Switches

Non-Programmable Thermostats

Programmable Thermostats

Thermostat Accessories

Ducting & Venting

Duct Fittings

Ventilation Dampers

Vents

Electric Heating

Convection Heaters

Fan Forced Heaters

Floor Warming

Heater Parts & Accessories

Ice & Snow Melting

View All

Exhaust & Ventilation

Air Curtains

Air Filters

Bathroom Fan

Housing & Grill Assembly

In-Line Ventilation Fans

View All

Thermal Management

Coolers & Air Conditioners

Enclosure Dehumidifiers

Enclosure Heaters

Enclosure Thermal Controls

Fan Parts & Accessories

View All

Lighting

Ballasts, Starters & Capacitors

Ballast Accessories

Ballast Kits

Capacitors

Fluorescent Ballasts

Fluorescent Ignitors

View All

Fixtures

Emergency Lighting & Exit Sign

Hanging Chains & Stems

Hazardous Location & Vapor Tight Fixtures

Indoor Lighting Fixtures

Outdoor Lighting Fixtures

View All

Flashlights & Multi-Location Lights

Combo Flashlights

Docklights

Flashlights & Multi-Location Light Accessories

Handheld Flashlights

Headlamps

View All

Lamps

Compact Fluorescent Lamp (CFL)

Fluorescent Tubes

Halogen Bulbs

HID Bulbs

Incandescent Bulbs

View All

Lighting Controls & Accessories

Digital Lighting Management

Dimming Modules

Interface Modules

Lighting Control Panels

Lighting Control Switches

View All

Office & Packaging Supplies

Office Supplies

Binders

Blank Tags

Clocks

Computer Equipment

Food and Beverage

View All

Packaging Supplies

Boxes

Packaging Accessories

Power Distribution

Busway & Accessories

Bus Plugs

Busway Accessories

Circuit Breakers

Circuit Breaker Accessories

Low Voltage Power Circuit Breakers

Medium Voltage Power Circuit Breakers

Miniature Circuit Breakers

Molded Case Circuit Breakers

View All

Disconnect & Safety Switches

Fusible Safety Switches

Non-Fusible Safety Switches

Safety Switch Accessories

Transfer Switches

Fuses

Automotive Fuses

British & IEC Fuses

Cartridge & Blade Fuses

Current-Limiting Fuses

Dummy Fuses

View All

Grounding & Bonding Products

Busbar Accessories

Busbars

Flexible Braid Connectors

Ground Rods

Ground/Neutral Bars

View All

Load Centers

Load Center Accessories

Load Center Covers

Load Center Interiors

Pool & Spa Panel

Single Phase Main Breaker Load Centers

View All

Metering

Meter Parts & Accessories

Metering Sockets

Terminal/Tap Boxes

Panelboards

Main Breaker Kits

Main Lug Kits

Panelboard Enclosures

Panelboard Interiors

Panelboard Parts & Accessories

View All

Switchboard Accessories

Switchboard Parts & Accessories

Temporary Power

Power Outlet Panel & Pedestal Accessories

Unmetered Power Outlet Panels

Portable Power Distribution Box

Terminal Blocks, Taps & Strips

Terminal Block Accessories

Terminal Block Marker

Terminal Blocks

Terminal Strips

Transformers

Buck Boost Transformers

Constant Voltage Transformers

Control Power Transformers

Current Transformers

Encapsulated Transformers

View All

Power Sources & Motors

Batteries & Chargers

Battery Accessories

Non-Rechargeable Batteries

Product-Specific Batteries

Rechargeable Batteries

Generators & Accessories

Generator Accessories

Portable Generators

Standby Generators

Motors & Accessories

Motor Accessories

Motors

Power Supplies

DC Power Supplies

Power Conditioners

Power Inverters

Uninterruptible Power Supplies

Safety Products

Fire Safety

Alarms and Suppression Systems

Cabinets

Carbon Monoxide Alarms

CO & Smoke Combination Alarms

Covers

View All

First Aid & Wound Care

Diagnostic Equipment

Lockout/Tagout

Cable Lockouts

Electrical Lockouts

Lock Labels

Lockout Boxes

Lockout Centers and Stations

View All

Machine Safety

Safety Edges

Safety Mat Trim Kits

Safety Mats

Personal Protective Equipment

Boots, Shoes, & Foot Protection

Ergonomic Support Aids

Eye Protection & Accessories

Fall Protection

Gloves & Hand Protection

View All

Safety & General Apparel

Electrical-Protection Clothing

Flame Resistant & Arc Flash Clothing

Protection Clothing

Protective Cooling

Safety Signs & Labels

Identification Tapes

Label Holders

Label Printers

Labels and Markers

Markers

View All

Spill Containment

Spill Containment Carts and Dollies

Spill Kits

Traffic Control Products

Barriers and Safety Tapes

Cable/Hose Protectors

Chains & Ropes

Floor Signs/Cones

Solar Products

Balance of Systems

Surge Protection

Inverters

Microinverters

PV Module

Portable Solar

Switches & Wallplates

Combination Devices

Receptacle & Light

Receptacles & Receptacles

Switch & Light

Switch & Receptacle

Switch & Sensor

View All

Daylighting Controls

Fixture Mount

Recessed Mount

Wall Mount

Occupancy & Vacancy Sensors

Accessories

Box Mount

Ceiling Mount

Corner Mount

Fixture Mount

View All

Plugs & Connectors

Flanged Devices

Pin & Sleeve Devices

Single Pole Devices

Straight Blade Devices

Twist Lock Devices

View All

Power Strips & Multi-Outlet Converters

Converters & Adapters

Power Column & Poles

Power Strips

Surge Protective Device Accessories

Surge Protective Devices

Receptacles

GFCI & AFCI

Pin & Sleeve

Receptacle & Switch Wiring Modules

Receptacle Accessories

Single Pole Female Receptacles

View All

Switches

Appliance Switches

Nightlights

Wall Switches

Wall & Switch Plates

Aluminum Wall Plates

Metal Wall Plates

Nylon/Plastic Wall Plates

Stainless Steel Wall Plates

Weatherproof Wall Plates

View All

Tools & Instruments

Abrasives

Abrasive Accessories

Abrasive Hand Pads

Abrasive Rolls

Polishing Film

Brushes

Handheld Brushes

Power/Mounted Brushes

Cleaning Tools

Dusters

Vacuum Cleaners

Dispensing Tools

Dispensing Needles & Syringes

Fish Tapes & Conduit Tools

Conduit Bender Accessories

Conduit Deburring Tools

Conduit Heaters

Fish & Glow Rods

Fish Tape Accessories

View All

Hand Tools

Automotive Specialty

Bottle Openers

Bull Pins

Cable Tie Tools

Caulking Gun

View All

Ladders, Platforms and Scaffolding

Ladders

Metal Forming Tools

Hand Brakes/Shears
Brands
Solutions
Services
Markets
Rewards
About Us
Careers

Manage Cookies

We use essential cookies to make our site work. With your consent, we may also use non-essential cookies to improve user experience and analyze website traffic. By clicking “Accept All,” you agree to our website's cookie use as described in our Cookie Policy, or you can modify your preferences before proceeding.

Necessary Analytics Preferences Marketing

Knockout Plug/Seals

Filters (0)

Categories

< Return to Box Hardware & Accessories
Knockout Plug/Seals (87)

More Filters

Y (42)

1.38 Dia. in (3)
1.75 Dia. in (3)
1.88 Dia. in (3)
2.19 Dia in (3)
2.50 Dia. in (3)
1.56 Dia. in (2)
3.00 DIa. in (3)
0.56in Dia. in (2)

3.00 in (6)
5.00 in (7)
4.00 in (3)
10.00 in (3)
6.50 in (3)
5.25 in (2)
6.00 in (2)
0.75 in (1)

4.00 in (6)
12.00 in (4)
6.00 in (3)
7.00 in (3)
5.00 in (2)
7.50 in (2)
8.50 in (2)
0.75 in (1)

0.10 in (9)
0.75 in (6)
1.50 in (4)
1.00 in (6)
0.50 in (3)
1.25 in (2)
0.70 in (2)
1.015 in (1)

General Accessories (31)
Round (13)
1/2" - 2" conduit size knockout upgrade set (driver sold separately) (6)
Blank (6)
Hole Plugs (5)
Slotted, Hex Head (2)
Type PLG Internal Recessed Threaded Insert Plug (4)
Home Improvement & Commercial Supplies - Electrical (2)

Galvanized (11)
Polished (11)
ANSI 61 Gray Paint (7)
Powder Coat (7)
Textured (3)
Zinc Electroplated (3)
Coated (2)
Brushed (1)
- Smooth (1)

Gray (17)
Black (7)
Light Gray (6)
ANSI 61 Gray (2)
Grey (2)
White (1)
Natural (1)

Steel (36)
Plastic (11)
Stainless Steel (17)
Die-Cast Zinc (3)
Malleable Iron (3)
Polycarbonate Plastic (2)
304 Stainless Steel (1)
Carbon Steel (1)

Hoffman Enclosures (32)
Hammond Enclosure (29)
Hubbell Trade Select Boxes (6)
Arlington Industries (6)
Rab Electric (4)
Gedney Fittings (4)
Rack A Tiers (2)
Roxtec (2)
- Hubbell Wiegmann Enclosures (1)
- Hubbell Wiring Devices (1)

nVent Hoffman (26)
Hammond Manufacturing (26)
Hubbell (6)
Arlington (6)
Hoffman (6)
Rab Design Lighting (4)
O-Z/Gedney (4)
Rack-A-Tiers (2)
- Hubbell Wiring Device Kellems (1)
- Wiegmann (1)

Hol-Tite®, Hol-Sealers™ (25)
HP Series (18)
Trade-Select™ (6)
Hol-Sealers™ (7)
HPN4SS Series (6)
RAB Design Lighting (3)
Rack-A-Tiers (2)
HPN4PC Series (2)
- Twist-Lock® (1)
- Wiegmann (1)

Seal Extra Pushbutton Holes, Conduit Openings and Knockout Openings Against Dust, Dirt, Oil and Water with Hoffman Hol-Sealers and Can be used on Enclosure Walls up to 0.31 in Thick (10)
Designed to Seal Unused Pushbutton Holes, Conduit Openings and Knockout Holes Against Dust, Oil and Water (14)
Routing System is a System of Channel, Fittings, Covers, and Brackets Designed to Route, Manage, and Protect Fiber Optic and High Performance Copper Cabling Above Network Racks and Cabinets within Data Centers and Service Provider Facilities (6)
Seal Extra Pushbutton Holes, Conduit Openings and Knockout Openings Against Dust, Dirt, Oil and Water with Hoffman Hol-Sealers and can be used on Enclosure Walls Up to 0.31 in Thick (8)
Knockout (6)
Controls and Drives; Power Distribution (6)
Controls and Drives; Corrosive Environments; Power Distribution (5)
Designed to seal unused pushbutton holes, conduit openings and knockout holes against dust, oil and water. (2)

China (19)
USA (18)

Round (18)

Threaded NPT (4)

0.12 in (3)
0.7 in (1)

Home Improvement & Commercial Supplies - Electrical (2)

87 Products found of 8

Results per page

Product image for Conduit hole seal SS 3/4"

Conduit hole seal SS 3/4"

Manufacturer: Hoffman Enclosures

Catalog #: AS075SS

Electrozad South Part #: 56492

$49.68 /ea

pc

Compare

Product image for HOLE PLUG OIL TIGHT STL FOR 2.25in DIA KO

HOLE PLUG OIL TIGHT STL FOR 2.25in DIA KO

Manufacturer: Hammond Enclosure

Catalog #: HP125

Electrozad South Part #: 59021

$18.56 /ea

pc

Compare

Product image for HOLE PLUG .5in CONDUIT

HOLE PLUG .5in CONDUIT

Manufacturer: Hammond Enclosure

Catalog #: HP50

Electrozad South Part #: 37984

$9.53 /ea

pc

Compare

Product image for Conduit hole seal steel grey 1in

Conduit hole seal steel grey 1in

Manufacturer: Hoffman Enclosures

Catalog #: AS100

Electrozad South Part #: 16223

$26.96 /ea

pc

Compare

Product image for KNOCKOUT SEAL 0.75IN

KNOCKOUT SEAL 0.75IN

Manufacturer: Hubbell Trade Select Boxes

Catalog #: KO075

Electrozad South Part #: 31195

$20.17 /c (100 pc)

pc

Compare

Product image for PLug thread 3/4" zinc

PLug thread 3/4" zinc

Manufacturer: Rab Electric

Catalog #: 094399

Electrozad South Part #: 17040

$1.19 /ea

pc

Compare

Product image for Hole seal steel grey 22.5mm

Hole seal steel grey 22.5mm

Manufacturer: Hoffman Enclosures

Catalog #: ASPBG

Electrozad South Part #: 34025

$15.70 /ea

pc

Compare

Product image for KNOCKOUT SEAL 0.50IN

KNOCKOUT SEAL 0.50IN

Manufacturer: Hubbell Trade Select Boxes

Catalog #: KO050

Electrozad South Part #: 31095

$16.90 /c (100 pc)

pc

Compare

Product image for Conduit hole seal steel grey 1/2in

Conduit hole seal steel grey 1/2in

Manufacturer: Hoffman Enclosures

Catalog #: AS050

Electrozad South Part #: 15962

$15.70 /ea

pc

Compare

Product image for HOLE PLUGS STEEL

HOLE PLUGS STEEL

Manufacturer: Hammond Enclosure

Catalog #: HP300

Electrozad South Part #: 59959

*Call For Price*

Product image for Snap-in blank plastic black 1"

Snap-in blank plastic black 1"

Manufacturer: Arlington Industries

Catalog #: NM902

Electrozad South Part #: 54985

$60.28 /c (100 pc)

pc

Compare

Product image for HOLE PLUG OIL TIGHT STL FOR 1.88in DIA KO

HOLE PLUG OIL TIGHT STL FOR 1.88in DIA KO

Manufacturer: Hammond Enclosure

Catalog #: HP100

Electrozad South Part #: 58901

$16.67 /ea

pc

Compare

87 Products found of 8

Results per page

Compare

Products

Automation & Controls
Lighting & Controls
Power Distribution
Wire & Cable
All Products

Support

Open a Business Account
Register to Shop Online
Shipping & Returns Policy
Contact Us
Locations
Compliance
Accessibility (AODA)

Company Info

Careers
About
Terms & Conditions
Privacy
Manage Cookies