- Log In
  
  User Name
  
  Password
  
  Remember Me
  
  Forgot Password?
- Register

Home
Services and Solutions
Services
Brands
Promotions
Resources
Locations
About Us
Log In

Products

Adhesives, Chemicals & Lubricants Conduit, Raceway & Cable Support Control & Automation Data & Communication Electric Vehicle Charging Electrical Fittings Electrical Boxes & Covers Electric Utility & Outside Plant Products Enclosures Fasteners & Hardware Heat, Ventilation & Builder Products Lighting Office & Packaging Supplies Power Distribution Power Sources & Motors Safety Products Solar Products Tools & Instruments Welding & Soldering Wire Termination & Supplies Wire, Cords & Cables Wiring Devices

Adhesives, Chemicals & Lubricants

Adhesives

Anti-Oxidant Joint Compound

Applicators & Empty Cans

Cement

Duct Seal Compounds

Electrical Sealing Compounds

View All

Chemicals

Aerosol Dusters

Anti-Seize

Cleaners & Degreasers

Corrosion Inhibitors

Insecticides

View All

Cleaning Supplies

Paper Products

Rags

Oils & Lubricants

Lubricants

Oils

Paints & Coating

Coating

Masking Products

Paints

Tape & Pads

Corrosion Protection Tapes

Duct Tapes

Electrical Color Code Tapes

Foam Tapes

Masking Tapes

View All

Conduit, Raceway & Cable Support

Cable Tray & Accessories

Cable Tray

Cable Tray Ladders

Cable Tray Fittings & Accessories

Conduit

Metallic Conduit

Non-Metallic Conduit

Raceway Systems

Overfloor

Raceway Pre-Wired

Surface Raceway

Strut & Accessories

Single-Sided Strut

Double-Sided Strut

Strut Fittings & Accessories

Angles

Rooftop Support Blocks

Wireways, Fittings & Accessories

Wireways

Wireway Fittings & Accessories

Wiring Ducts, Fittings & Accessories

Wiring Ducts

Wiring Duct Fittings & Accessories

Control & Automation

Alarms & Signaling

Alarms

Beacons

Combination Light & Sound Devices

Door Openers

Doorbells & Chime Kits

View All

Automation Control Connectivity Devices

Control System Connection Cables

Control System Passive Distribution Boxes

Drive Accessories

Line and Load Reactors

Drives

AC Drives

Machine Safety

Safety Switches

Motor Controls & Accessories

Contactors & Starters

Motor Control Parts & Accessories

Pump Control Panels

Pilot Devices

Contact Blocks

Emergency Stop Devices

Indicator Pilot Lights

Legend Plates

Pendant Station

View All

PLCs & HMI

PLC

Relay & Timers

Relays

Timers

Sensors & Switches

Sensors

Switches

Terminal Blocks & Connectors

Din Rail Terminal Blocks

PCB Pluggable Connectors

Terminal Block Accessories

Data & Communication

Audio & Video Systems

A/V Distribution Amplifiers

A/V Receivers

Audio & Video System Accessories

Speaker 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 Adapters

Fiber Optic Connectors

Fiber Optic Patch Panels

Networking Hardware

Modems & Gateways

Signal Jammers

Wired Networking

Wireless Networking

Racks, Enclosures & Cable Management

Data Cable Support Systems

Enclosure & Cabinet Accessories

Network Cabinets

Rack Shelves

Structured Wiring Enclosures

Security, Video & Surveillance

Intercoms & Paging Systems

Two-Way Radios

Video Cameras

Video Monitors

Electric Vehicle Charging

Electric Vehicle Chargers

Electric Vehicle Charger Accessories

Electrical Fittings

Adapters

ENT Adapters

PVC Adapters

Box Spacers

Bushings

Rigid Conduit Bushings

Grounding Bushings

EMT Conduit Bushings

Reducing Bushings

PVC Bushings

View All

Caps & Plugs

Metallic Conduit Plugs

PVC/Plastic Conduit Caps

PVC/Plastic Conduit Plugs

Clamps, Hangers, Straps & Supports

Beam Clamps

Conduit Clips & Clamps

Conduit Repair Kits

Conduit Spacers

Conduit Supports

View All

Combination Fittings

EMT To Flex. Combination Fittings

EMT To Liquid Tight Combination Fittings

EMT To Rigid Combination Fittings

Concrete Inserts & Sleeves

Rigid Concrete Inserts

Conduit Body, Covers, & Gaskets

Metallic Conduit Body, Covers, & Gaskets

PVC Coated Conduit Body, Covers, & Gaskets

PVC Conduit Body, Covers, & Gaskets

Conduit Hubs

Rigid Conduit Hubs

PVC Coated Rigid Conduit Hubs

Conduit Locknuts

Conduit Plugs

Conduit Unions

Conduit Washers

Reducing Washers

Sealing Washers

Connectors

EMT Connectors

ENT Connectors

Flexible Metallic Conduit (FMC) Connectors

Flexible Non-Metallic Conduit (FNMC) Connectors

Liquidtight Connectors

View All

Cable Grips / Cord Connectors

Strain Relief Grips

Support Grips

Pulling Grips

Cord Connectors - Metallic

Cord Connectors - Non-Metallic

Couplings

EMT Couplings

Colored EMT Couplings

ENT Couplings

Flexible Metallic Conduit Couplings

Liquidtite Couplings

View All

Elbows

EMT Elbows

Rigid Elbows

PVC Elbows

PVC Coated Elbows

End Bells

Expansion Fittings

EMT Expansion Fittings

Rigid Expansion Fittings

PVC Expansion Fittings

PVC Coated Expansion Fittings

Hazardous Location Fittings

Cable & Cord Fittings

Cable Glands

Capped Pulling Elbows

Conduit Couplings

Conduit Elbows

View All

Knockout Seals & Plugs

Nipples / Offsets

Closed Nipples

Straight Nipples

EMT Nipples

Chase Nipples

Offset Nipples

View All

Service Entrance Fittings

Mast Kits

Service Entrance Caps

Service Entrance Straps

Wireholders

Stubs

Electrical Boxes & Covers

FS / FD Boxes & Covers

Metallic FS / FD Boxes

Metallic FS / FD Box Covers

Non-Metallic FS / FD Boxes

Non-Metallic FS / FD Box Covers

Communication & Low Voltage

Countertop Boxes

Electrical Box Extension & Brackets

Electrical Box Brackets

Electrical Box Extensions

Electrical Box Partitions

Fire Rated Poke Through Boxes

Floor Boxes, Covers & Carpet Flanges

Floor Boxes

Floor Box Covers

Flanges

Floor Box Accessories

Junction Boxes & Covers

Junction Boxes

Junction Box Covers & Accessories

Masonry / Concrete Boxes

Octagon/Round Boxes & Covers

Metallic Octagon Boxes

Metallic Round Boxes

Metallic Round/Octagon Covers

Non-Metallic Octagon Boxes

Non-Metallic Round Boxes

View All

Outlet/Switch Boxes & Covers

Metallic Outlet/Switch Boxes

Metallic Outlet/Switch Covers

Non-Metallic Outlet/Switch Boxes

Square Boxes & Covers

4" Square Boxes

4" Square Surface Covers

4-11/16" Square Boxes

4-11/16" Square Surface Covers

TV / Specialty Boxes

Utility Enclosures & Covers

Utility Enclosures

Utility Enclosure Covers

Vaportight / Airtight Boxes

Weatherproof Boxes, Covers, & Accessories

Weatherproof Boxes

Weatherproof Covers

Weatherproof Accessories

Box Hardware & Accessories

Gaskets

Grounding Devices & Accessories

Hangers

Spacers & Shims

Supports

Electric Utility & Outside Plant Products

Arrestors & Cutouts

Arresters

Utility Anchors

Anchor Accessories

Expanding Anchors

Rock Anchors

Utility Connectors

Distribution/Transmission

Grounding Products

Utility Fuse Links

Type T Fuselink

Utility Hardware

Guying Hardware

Spring Bolt Assembly

Transmission Hardware

Utility Fasteners

Wireholders

Utility Insulators

Specialty Insulators

Standoff & Bus Support Insulators

Utility Poles & Supports

Concrete Poles

Pole Extensions

Wood Poles

Enclosures

Circuit Breaker Enclosures

Covers, Backplates & Accessories

Current Transformer Cabinets

Disconnect Type Enclosures

Metallic

Enclosure Panels

Latch-Lock & Handles

Pilot Device Enclosures

Metallic

Non-Metallic

Telephone Cabinets

Thermal Management

Fan Parts & Accessories

Underground Enclosures & Boxes

Metallic

Non-Metallic

Wall Mount Enclosures

Metallic

Non-Metallic

Metering Cabinets

Pull Boxes

Fasteners & Hardware

Assortment Kits

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

Tie-Down Straps

Fasteners

Bolts, Screws & Studs

Nuts & Washers

Gas Springs

Hardware

Anchors

Braces and Brackets

Clamps

Nail Plates

Wire

View All

Miscellaneous Fasteners

Ceiling Hangers

Grommets

Nails, Tacks & Pins

Powder Fastening Products

Spring Steel Fasteners

View All

Power Transmission

Enclosed Gearing

Universal Joint

PVF (Pipes, Valves, Fittings)

Pipe Hanger

Tubing Fittings

Compression Nuts/Sleeves

Tube Fittings

Heat, Ventilation & Builder Products

Air Circulators

Blowers, Motors & Accessories

Ceiling Fans

Fan Parts & Accessories

Table/Floor Fans

Wall Fans

View All

Central Vacuum Systems

Hoses & Accessories

Power Units

Controls & Thermostats

Fan Controls & Switches

Non-Programmable Thermostats

Programmable Thermostats

Doorbells & Chime Kits

Ducting & Venting

Duct Fittings

Flexible Ducts

Roof Flashings

Electric Heating

Fan Forced Heaters

Heater Parts & Accessories

Portable Heaters

Radiant Heaters

Exhaust & Ventilation

Attic Ventilators

Bathroom Fan

Housing & Grill Assembly

Range Hoods

Ventilation Fan Accessories

Lighting

Ballasts, Starters & Capacitors

Capacitors

Fluorescent Ballasts

Fluorescent Ignitors

HID Ballast Igniters

HID Ballasts

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

Flashlights & Multi-Location Light Accessories

Handheld Flashlights

Headlamps

Strip/Rope Lights

View All

Lamps

Compact Fluorescent Lamp (CFL)

Fluorescent Tubes

Halogen Bulbs

HID Bulbs

Incandescent Bulbs

View All

Lighting Controls & Accessories

Dimming Modules

Interface Modules

Lighting Control Panels

Lighting Control Switches

Load Controllers

View All

Office & Packaging Supplies

Office Supplies

Computer Equipment

Markers

Packaging Supplies

Stretch Film

Power Distribution

Busway & Accessories

Bus Plugs

Busways

Circuit Breakers

Low Voltage Power Circuit Breakers

Medium Voltage Power Circuit Breakers

Miniature Circuit Breakers

Residential Circuit Breakers

Circuit Breaker Accessories

Disconnect & Safety Switches

Fusible Safety Switches

Non-Fusible Safety Switches

Safety Switch Accessories

Transfer Switches

Fuses

Automotive Fuses

British & IEC Fuses

Current-Limiting Fuses

Dummy Fuses

Fuse Accessories

View All

Grounding & Bonding Products

Busbars

Ground Rods

Ground/Neutral Bars

Grounding & Bonding Clamps

Grounding & Bonding Connectors

View All

Load Centers

Load Center Accessories

Load Center Covers

Load Center Interiors

Pool & Spa Panel

Single Phase Convertible Load Centers

View All

Metering

Meter Parts & Accessories

Metering Sockets

Meters

Terminal/Tap Boxes

Panelboards & Accessories

Main Breaker Kits

Main Lug Kits

Panelboard Enclosures

Panelboard Interiors

Panelboard Parts & Accessories

View All

Surge Protection

Circuit Breaker SPD

External Load Center SPD

Temporary Power

Metered Power Outlet Panels

Metered Power Outlet Pedestals

Unmetered Power Outlet Panels

Terminal Blocks, Taps & Strips

Terminal Block Accessories

Terminal Blocks

Terminal Strips

Transformers

Buck Boost Transformers

Control Power Transformers

Encapsulated Transformers

Isolation Transformer

Low Voltage Transformers

View All

Power Sources & Motors

Batteries & Chargers

Battery Accessories

Non-Rechargeable Batteries

Product-Specific Batteries

Rechargeable Batteries

Generators & Accessories

Generator Accessories

Inverter Generators

Portable Generators

Standby Generators

Motors & Accessories

Motor Accessories

Motors

Power Supplies

DC Power Supplies

Safety Products

Electrical Safety

Insulating Blanket Accessoriers

Fire Safety

Alarms and Suppression Systems

Carbon Monoxide Alarms

CO & Smoke Combination Alarms

Fire Barriers

Fire Extinguishers

View All

First Aid & Wound Care

Cotton Balls/Tips

Diagnostic Equipment

Eye Protection & Accessories

First Aid Kits

Topical Ointments, Creams, & Antiseptics

Insect and Pest Control

Insect and Animal Repellents

Lockout/Tagout

Cable Lockouts

Electrical Lockouts

Lockout Boxes

Lockout Hasps

Lockout Kits

View All

Personal Protective Equipment

Boots, Shoes, & Foot Protection

Ergonomic Support Aids

Eye Protection & Accessories

Fall Protection

Gloves & Hand Protection

View All

Coolers, Tumblers & Hydration

Coolers & Accessories

Bottled Water & Sports Drinks

Cup Dispensers & Disposable Cups

Drink Tumblers

Safety Apparel

Electrical-Protection Clothing

Flame Resistant & Arc Flash Clothing

High-Visibility Clothing

Protective Cooling

Rainwear Clothing

View All

Safety Signs & Labels

Label Printers

Labels and Markers

Placards

Signage and Identification Accessories

Signs and Tags

Safety Storage Cabinets & Containers

Safety Cans

Traffic Control Products

Barriers and Safety Tapes

Floor Signs/Cones

Traffic Cones & Posts

Solar Products

Balance of Systems

Combiner Box

Connectors

Pass Through Boxes

Surge Protection

Flashings

Off Grid

Battery Based Inverters

Racking

Clamp

Grounding

Hardware

L-Foot

Rail

View All

Tools

Racking Tools

Photovoltaic Wires (PV)

Tools & Instruments

Abrasives

Abrasive Discs

Abrasive Files

Abrasive Rolls

Abrasive Wheels

Brushes

Handheld Brushes

Power/Mounted Brushes

Cleaning Tools

Dusters

Vacuum Cleaners

Dispensing Tools

Funnels

Sprayers

Fish Tapes & Conduit Tools

Conduit Bender Accessories

Conduit Heaters

Fish & Glow Rods

Fish Tape Accessories

Fish Tapes

View All

Hand Tools

Automotive Specialty

Bottle Openers

Bull Pins

Cable Tie Tools

Caulking Gun

View All

Ladders, Platforms and Scaffolding

Ladders

Scaffolding

Paint Tools & Equipment

Spray Paint Applicators

Power Tools & Attachments

Attachments

Corded Power Tools

Cordless Power Tools

Drain Cleaners

Gas Power Tools

View All

Storage & Material Handling

Casters & Wheels

Lifting & Rigging

Manual Handling

Storage

Tie Downs

View All

Testing Instruments

Borescope

Circuit Tracers

Clamp Meters

Continuity Testers

Distance Meters

View All

Tool Kits & Reference Manuals

Reference Manuals

Tool Kits

Watering Equipment

Garden Hoses and Nozzles

Workholding

Clamping Hardware

Drill Bushings

Welding & Soldering

Exothermic Welding

Controllers

Gas Welding Equipment

Fuel Cylinders

Torch & Torch Kits

MIG Welding & Accessories

Soldering

Soldering Irons, Guns & Pots

Welding Accessories

Welding Cable Connectors, Grounds, & Accessories

Cable Lugs

Welding Consumables

Weld Materials

Welding Supplies

Flint Ignitors

Welding Links & Clamps

Wire Termination & Supplies

Bundling & Securing

Cable Clips, Clamps & Straps

Cable Hooks, Hangers & Stackers

Cable Staples

Cable Ties

Cable Tie Mounting Bases

View All

Cold & Heat Shrink

Cold Shrink

End Caps

Heat Shrink Boots

Heat Shrink Kits

Heat Shrink Tubing

Grounding Products

Grounding Bridges

Grounding Clips

Grounding Grid Connectors

Lugs & Connectors

Compression Lugs

Compression Sleeves

Insulation Piercing Connectors

Mechanical Lugs

Multi-Tap Connectors

View All

Marking & Labeling

Clip-On/Slip-On Wire Markers

Heat Shrink Wire Markers

Label Printer Accessories

Label Printers

Labeling Pens

View All

Small Crimp & Wire Connectors

Butt Connectors

Crimp Connectors

Disconnects

Ferrules

Fork Terminals

View All

Splicing & Terminating Kits

Resin Splices

Splice Kits

Welded Connections

Molds - Cable to Cable

Molds - Cable to Ground

Molds - Cable to Lug or Busbar

Molds - Cable to Surface

Wire, Cords & Cables

Aluminum Building Wires & Cables

ACSR Aluminum Conductor Steel Reinforced Service Drop Cables

Aluminum Service Drop

RHH/RHW/USE Underground Service Entrance Cables

SER Service Entrance Cables

SEU Service Entrance Cables

View All

Copper Building Wires & Cables

Bare Copper Wire

NM Non-Metallic Sheathed Cables

Photovoltaic Wires (PV)

RHH/RHW/USE Underground Service Entrance Cables

SER Service Entrance Cables

View All

DataComm & Low Voltage Cable

Fire Alarm Cables

Thermostat Wires

Voice, Data & Video Cables

Extension Cords, Cord Reels & Portable Boxes

Appliance / Power Supply Cords

Cord Reels

Indoor & Outdoor Extension Cords

In-Line GFCI Cords

Specialty Connectors

Flexible & Portable Cords

SEO/SEOW/SEOOW Portable Cord - 600V Thermoplastic Jacket

SJEO/SJEOW/SJEOOW Portable Cord - 300V Thermoplastic Elastomer Jacket

SJO/SJOW/SJOOW Portable Cord - 300V Thermoset Jacket

SJT/SJTW/SJTO/SJTOW/SJTOOW Portable Cord - 300V Thermoplastic Jacket

SO/SOW/SOOW Portable Cord - 600V Thermoset Rubber Jacket

View All

Hook-Up, Lead & High Temperature Wires

MTW Machine Tool Wires

Metal Clad & Armored Cables

Aluminum AC Cables

Aluminum MC Cables

HCFC Health Care Facilities MC Cables

PCS Power & Control/Signal MC Cables

Steel AC Cables

View All

Tray Cables & Instrumentation Cables

Instrumentation Tray Cables

PLTC Power-Limited Tray Cables

Tray Cables-600V

VNTC Vinyl Nylon Tray Cables

Wiring Devices

Combination Devices

Receptacle / Light

Receptacle / Receptacle

Switch / Light

Switch / Receptacle

Switch / Sensor

View All

Daylighting Controls

Fixture Mount

Recessed Mount

Wall Mount

Occupancy & Vacancy Sensors

Ceiling Mount

Wall Mount

Wireless Sensors

Accessories

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

Surge Protective Device Accessories

Receptacles

GFCI & AFCI

Pin & Sleeve

Receptacle & Switch Wiring Modules

Receptacle Accessories

Single Pole Female Receptacles

View All

Switches

Appliance Switches

Wall Switches

Wall & Switch Plates

Aluminum Wall Plates

Metal Wall Plates

Nylon/Plastic Wall Plates

Stainless Steel Wall Plates

Weatherproof / Dustproof Wall Plates

View All
Services
Brands
Promotions
Resources
Locations
About Us

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 Seals & Plugs

Filters (2)

Categories

< Return to Electrical Fittings
Knockout Seals & Plugs (2)

More Filters

1.8 Inch (1)
4-3/8 Inch (1)
0.31 Inch (1)
0.36 Inch (1)
0.37 Inch (1)
1-1/2 Inch (1)
1-1/4 Inch (1)
1/4 Inch (1)

Raco Manufacturing (1)
Arlington Industries (1)

USA (1)

5/8 Inch (1)

1-1/4 Inch (1)
3-1/2 Inch (1)

Plated (1)

Two piece (1)

2 Products found 1 of 1

Results per page

Height: 1.8 Inch Height: 4-3/8 Inch

Product image for RACO 1040 2-Piece 3-1/2 Inch Steel Knockout Seal

RACO 1040 2-Piece 3-1/2 Inch Steel Knockout Seal

Manufacturer: Raco Manufacturing

Catalog #: 1040

World Electric Part #: 17691

$5,030.31/c (100 ea)

ea

Compare

Product image for Arlington 903 1-1/4" Snap-In Blank, Steel

Arlington 903 1-1/4" Snap-In Blank, Steel

Manufacturer: Arlington Industries

Catalog #: 903

World Electric Part #: 21882

See More Options

$161.13/c (100 ea)

ea

Compare

2 Products found 1 of 1

Results per page

Compare

Customer Tools

Contact Us
(800) 351-5240
Manage Cookies

Company Info

Careers
About
Terms & Conditions
Privacy Policy

Social