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 Welding & Soldering Wire Termination & Supplies Wire, Cords & Cables EV Charging Stations

Adhesives, Chemicals & Lubricants

Adhesives

Anti-Oxidant Joint Compound

Duct Seal Compounds

Electrical Sealing Compounds

Fire Barrier Sealants and Foam

PVC Cement

View All

Chemicals

Anti-Seize

Cleaners & Degreasers

Corrosion Inhibitors

Freezer Sprays

Solvents

View All

Cleaning Supplies

Garbage Bags & Containers

Paper Products

Restroom Supplies

Oils & Lubricants

Lubricants

Oils

Paints & Coating

Coating

Paints

Tapes & Pads

Duct Tapes

Electrical Color Code Tapes

Filament Tapes

Foam Tapes

Glass Cloth 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

Strut Fittings & Accessories

Wireways, Fittings & Accessories

Wireway Fittings & Accessories

Wireways

Wire Troughs

Wiring Ducts, Fittings & Accessories

Wiring Duct Fittings & Accessories

Wiring Ducts

Control & Automation

Alarms & Signaling

Alarms

Beacons

Combination Light & Sound Devices

Door Holders

Doorbells & Chime Kits

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

Servo Drives

Machine Safety

Light Curtains

Safety Control Modules

Safety Switches

Motor Controls & Accessories

Contactors & Starters

Encoders

Encoders Parts & Accessories

Motor Control Parts & Accessories

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

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

Signal Isolators & Converters

Data & Communication

Audio & Video Systems

Audio & Video System Accessories

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 Connectivity Kits

Fiber Optic Connectors

View All

Networking Hardware

Modems & Gateways

Network Interface Cards

Transceivers

Wired Networking

Wireless Networking

Racks, Enclosures & Cable Management

Cable Management Panel Accessories

Cable Management Panels

Enclosure & Cabinet Accessories

Fiber Optic Enclosures

Network Cabinets

View All

Electric Utility & Outside Plant Products

Utility Connectors

Distribution/Transmission

Distribution

Grounding Products

Utility Hardware

Coupling Hardware

Mounts & Brackets

Transmission Hardware

Underground Cable Racks

Utility Fasteners

Utility Poles & Supports

Pole Accessories

Utility Tools

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

Disconnect Type Enclosures

Door Stop Kits

Electrical Console & Consolet Enclosure

View All

Fasteners & Hardwares

Assortment Kit

Bolt, Screw & Stud Kit

Chain, Cable, Rope & Accessories

Fittings & Accessories

Cable Management Accessories

Fasteners

Bolts, Screws & Studs

Nuts & Washers

Hardware

Anchors

Braces and Brackets

Clamps

Shims & Shim Stock

Springs

Hose Fittings

Hose Clamps

Miscellaneous Fasteners

Grommets

Rivets

Staples

PVF (Pipes, Valves, Fittings)

Fittings

Tubing Fittings

Compression Nuts/Sleeves

Heat and Ventilation

Air Circulators

Air Conditioner Parts & Accessories

Air Conditioners

Axial Fans

Ceiling Fans

Fan Parts & Accessories

View All

Central Vacuum Systems

Central Vacuum Packages & Kits

Hoses & Accessories

Inlets & Fittings

Power Units

Vacuum Bags & Filters

Controls & Thermostats

Fan Controls & Switches

Non-Programmable Thermostats

Programmable Thermostats

Thermostat Accessories

Ducting & Venting

Duct Fittings

Ventilation Dampers

Electric Heating

Convection Heaters

Fan Forced Heaters

Floor Warming

Heater Parts & Accessories

Ice & Snow Melting

View All

Exhaust & Ventilation

Bathroom Fan

Housing & Grill Assembly

Range Hoods

Ventilation Fan Accessories

Thermal Management

Coolers & Air Conditioners

Enclosure Dehumidifiers

Enclosure Heaters

Enclosure Thermal Controls

Fan Parts & Accessories

View All

Lighting

Ballasts, Starters & Capacitors

Capacitors

Fluorescent Ballasts

LED Drivers

Fixtures

Emergency Lighting & Exit Sign

Hazardous Location & Vapor Tight Fixtures

Indoor Lighting Fixtures

Outdoor Lighting Fixtures

Replacement Lens & Wire Guards

Flashlights & Multi-Location Lights

Combo Flashlights

Flashlights & Multi-Location Light Accessories

Handheld Flashlights

Headlamps

Work Lights

Lamps

Fluorescent Tubes

Halogen Bulbs

Incandescent Bulbs

Lamp Accessories

LED Bulbs

View All

Lighting Controls & Accessories

Digital Lighting Management

Dimming Modules

Lighting Control Switches

Lighting Control Systems

Load Controllers

View All

Office & Packaging Supplies

Office Supplies

Computer Equipment

Food and Beverage

Labels

Markers

Staplers

Power Distribution

Busway & Accessories

Bus Plugs

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

Fuses

Automotive Fuses

British & IEC Fuses

Cartridge & Blade Fuses

Current-Limiting Fuses

Fuse Accessories

View All

Grounding & Bonding Products

Busbar Accessories

Busbars

Flexible Braid Connectors

Ground/Neutral Bars

Grounding & Bonding Clamps

View All

Load Centers

Load Center Accessories

Load Center Covers

Pool & Spa Panel

Single Phase Main Breaker Load Centers

Single Phase Main Lug Load Centers

View All

Metering

Meter Parts & Accessories

Metering Sockets

Terminal/Tap Boxes

Panelboards

Main Breaker Kits

Panelboard Enclosures

Panelboard Interiors

Panelboard Parts & Accessories

Panelboard Trims

View All

Switchboard Accessories

Switchboard Parts & Accessories

Temporary Power

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

Non-Rechargeable Batteries

Rechargeable Batteries

Generators & Accessories

Generator Accessories

Standby Generators

Motors & Accessories

Motor Accessories

Motors

Power Supplies

DC Power Supplies

Power Conditioners

Uninterruptible Power Supplies

Safety Products

Fire Safety

Alarms and Suppression Systems

Carbon Monoxide Alarms

CO & Smoke Combination Alarms

Covers

Heat Alarms

View All

First Aid & Wound Care

Diagnostic Equipment

Lockout/Tagout

Cable Lockouts

Electrical Lockouts

Lockout Boxes

Lockout Centers and Stations

Lockout Devices Accessories

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

Label Printers

Labels and Markers

Name Plates

Placards

Signs and Tags

Spill Containment

Spill Kits

Traffic Control Products

Barriers and Safety Tapes

Cable/Hose Protectors

Floor Signs/Cones

Solar Products

Balance of Systems

Surge Protection

PV Module

Portable Solar

Switches & Wallplates

Combination Devices

Receptacle & Light

Receptacles & Receptacles

Switch & Light

Switch & Receptacle

USB & Receptacle

Daylighting Controls

Wall Mount

Occupancy & Vacancy Sensors

Accessories

Ceiling Mount

Corner Mount

Fixture Mount

Wall 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 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

Metal Wall Plates

Nylon/Plastic Wall Plates

Stainless Steel Wall Plates

Weatherproof Wall Plates

Non Metal Wall Plates

View All

Tools & Instruments

Abrasives

Abrasive Accessories

Cleaning Tools

Dusters

Vacuum Cleaners

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

Communication Connector Tools

View All

Ladders, Platforms and Scaffolding

Ladders

Metal Forming Tools

Hand Brakes/Shears

Power Tools & Attachments

Attachments

Corded Power Tools

Cordless Power Tools

Hydraulic Tools

Pneumatic Tools

View All

Storage & Material Handling

Chairs/Benches/Stools

Lifting & Rigging

Manual Handling

Storage

Work Stands

View All

Testing Instruments

Borescope

Cable Length Meters

Circuit Tracers

Clamp Meters

Continuity Testers

View All

Tool Kits & Reference Manuals

Tool Kits

Welding & Soldering

Welding Consumables

Weld Materials

Wire Termination & Supplies

Bundling & Securing

Braided Sleeving

Cable Hooks & Hangers

Cable Tie Mounting Bases

Cable Ties

Corrugated Tubing

View All

Cold & Heat Shrink

Cold Shrink

End Caps

Heat Shrink Boots

Heat Shrink Repair Sleeves

Heat Shrink Tubing

Grounding Products

Grounding Grid Connectors

Lugs & Connectors

Compression Lugs

Compression Sleeves

Mechanical Lugs

Multi-Tap Connectors

Press-On Lugs

View All

Marking & Labeling

Clip-On/Slip-On Wire Markers

Heat Shrink Wire Markers

Label Printer Accessories

Label Printers

Printer Label Cartridges

View All

Small Crimp & Wire Connectors

Butt Connectors

Crimp Connectors

Disconnects

Ferrules

Fork Terminals

View All

Splicing & Terminating Kits

Resin Splices

Splice Kits

Wire, Cords & Cables

Copper Building Wires & Cables

Heating Cables

Mineral Insulated Cables

DataComm & Low Voltage Cable

Voice, Data & Video Cables

Extension Cords, Cord Reels & Portable Boxes

Appliance Replacement & Power Supply Cords

Cord Reels

In-Line GFCI Cords

Hook-Up, Lead & High Temperature Wires

MTW Machine Tool Wires

SRML Silicone Rubber Motor Lead Wires

Hook-Up & Lead Wires

Metal Clad & Armored Cables

Steel MC Cables

Tray Cables & Instrumentation Cables

PLTC Power-Limited Tray Cables

TC-ER or PLTC-ER (Exposed Run) Cables

Tray Cables-600V

VNTC Vinyl Nylon Tray Cables

EV Charging Stations

Commercial EV Charging Stations

Level 2 Commercial Chargers
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 (52)

More Filters

Y (33)

Hoffman Enclosures (19)
Hammond Enclosure (17)
Arlington Industries (6)
Hubbell Trade Select Boxes (6)
Rack A Tiers (2)
Roxtec (2)

nVent Hoffman (18)
Hammond Manufacturing (16)
Arlington (6)
Hubbell (6)
Rack-A-Tiers (2)
Hoffman (1)

General Accessories (19)
Round (11)
1/2" - 2" conduit size knockout upgrade set (driver sold separately) (6)
Blank (6)
Hole Plugs (5)
Home Improvement & Commercial Supplies - Electrical (2)

Designed to Seal Unused Pushbutton Holes, Conduit Openings and Knockout Holes Against Dust, Oil and Water (12)
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)
Knockout (6)
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 (5)
Controls and Drives; Corrosive Environments; Power Distribution (3)
Designed to seal unused pushbutton holes, conduit openings and knockout holes against dust, oil and water. (2)
For Designed to Seal Unused Push Button Holes, Conduit Openings and Knockout Holes Against Dust, Oil and Water (1)
- For 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 (1)
- For designed to seal unused pushbutton holes, conduit openings and knockout holes against dust, oil and water (1)

Steel (28)
Plastic (11)
Stainless Steel (5)
304 Stainless Steel (1)

Hol-Tite®, Hol-Sealers™ (17)
HP Series (16)
Trade-Select™ (6)
Hol-Sealers™ (2)
Rack-A-Tiers (2)

Galvanized (10)
ANSI 61 Gray Paint (7)
Polished (5)
Textured (3)
Coated (2)
Brushed (1)
Powder Coat (1)

3.00 in (6)
4.00 in (3)
5.00 in (3)
5.25 in (2)
6.00 in (2)
1.015 in (1)
1.250 in (1)
1.500 in (1)

1.38 Dia. in (3)
1.56 Dia. in (2)
1.88 Dia. in (2)
2.19 Dia in (2)
2.50 Dia. in (2)
1 1/2 in (1)
1 1/4 in (1)
1 in (1)

Gray (14)
Black (6)
Grey (2)
ANSI 61 Gray (1)
Light Gray (1)
Natural (1)

0.10 in (7)
1.00 in (3)
0.50 in (2)
0.70 in (2)
1.25 in (2)
0.75 in (1)
1.015 in (1)
1.250 in (1)

China (16)
USA (7)

4.00 in (6)
6.00 in (3)
7.00 in (2)
12.00 in (1)
2.20 in (1)
3.00 in (1)
5.00 in (1)
7.40 in (1)

Round (16)

0.12 in (3)

Home Improvement & Commercial Supplies - Electrical (2)

52 Products found of 5

Results per page

Product image for HOLE PLUGS STEEL

HOLE PLUGS STEEL

Manufacturer: Hammond Enclosure

Catalog #: HP250

Electrozad South Part #: 59616

*Call For Price*

Product image for ROXTEC CM20 MODULE C000100201000

ROXTEC CM20 MODULE C000100201000

Manufacturer: Roxtec

Catalog #: C000100201000

Electrozad South Part #: 15888

$10.08 /ea

pc

Compare

Product image for Conduit hole seal polyester grey 3.5x2x0.12in

Conduit hole seal polyester grey 3.5x2x0.12in

Manufacturer: Hoffman Enclosures

Catalog #: AS150200250NM

Electrozad South Part #: 232668

*Call For Price*

Product image for Conduit hole seal SS 1 1/4"

Conduit hole seal SS 1 1/4"

Manufacturer: Hoffman Enclosures

Catalog #: AS125SS

Electrozad South Part #: 3632

$76.04 /ea

pc

Compare

Product image for HOLE PLUGS STEEL

HOLE PLUGS STEEL

Manufacturer: Hammond Enclosure

Catalog #: HP400

Electrozad South Part #: 60555

*Call For Price*

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 1-1/2"

Snap-in blank plastic black 1-1/2"

Manufacturer: Arlington Industries

Catalog #: NM904

Electrozad South Part #: 55000

$109.76 /c (100 pc)

pc

Compare

Product image for HOLE PLUGS STEEL

HOLE PLUGS STEEL

Manufacturer: Hammond Enclosure

Catalog #: HP22

Electrozad South Part #: 37883

$9.30 /ea

pc

Compare

Product image for HOLE PLUGS STEEL LG

HOLE PLUGS STEEL LG

Manufacturer: Hammond Enclosure

Catalog #: HP75LG

Electrozad South Part #: 409892

*Call For Price*

Product image for HOLE PLUGS STEEL

HOLE PLUGS STEEL

Manufacturer: Hammond Enclosure

Catalog #: HPB

Electrozad South Part #: 103637

$12.64 /ea

pc

Compare

Product image for Filler plastic knockout 3/4" 50/bag

Filler plastic knockout 3/4" 50/bag

Manufacturer: Rack A Tiers

Catalog #: KOK75

Electrozad South Part #: 45192

$33.08 /c (100 pc)

pc

Compare

Product image for HOLE PLUG STAINLESS STEEL

HOLE PLUG STAINLESS STEEL

Manufacturer: Hammond Enclosure

Catalog #: HP200SS

Electrozad South Part #: 61170

*Call For Price*

52 Products found of 5

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