Knockout Bushings | McMaster-Carr

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Conduit Trade Size

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Adjustable-Angle Elbow

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For Conduit Flexibility

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Knockout Connection

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Knockout Trade Size

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627 Products

About Conduit

Reducing Washers for Medium-Wall (IMC)
and Thick-Wall (Rigid) Steel Conduit

Reduce the knockout size in an outlet box or enclosure so you can attach a different size of conduit to it.

Raintight Reducing Washers for Medium-Wall
(IMC) and Thick-Wall (Rigid) Steel Conduit

Seal out moisture while reducing the knockout size in an outlet box or enclosure so you can attach a different size of conduit to it.

Adapters for Medium-Wall (IMC)
and Thick-Wall (Rigid) Steel Conduit

Attach conduit to a knockout in an outlet box or enclosure.

Connectors for Medium-Wall (IMC)
and Thick-Wall (Rigid) Steel Conduit

Join pieces of conduit.

Adapters for Rigid PVC Conduit

Attach conduit to a knockout in an outlet box or enclosure.

Adapters for Rigid Stainless Steel Conduit

Attach conduit to a knockout in an outlet box or enclosure.

Hazardous Location Conduit Adapters

Attach conduit to a knockout in an outlet box or enclosure.

Adapters for Rigid Aluminum Conduit

Attach conduit to a knockout in an outlet box or enclosure.

Adapters for Thin-Wall (EMT) Steel Conduit

Attach conduit to a knockout in an outlet box or enclosure.

Adapters for Thin-Wall (EMT)
Stainless Steel Conduit

Attach conduit to a knockout in an outlet box or enclosure.

Adapters for Choose-a-Color
Thin-Wall (EMT) Steel Conduit

Attach conduit to a knockout in an outlet box or enclosure.

Conduit Fitting Locknuts

Locknuts for Metal Conduit Fittings

Secure threaded metal conduit fittings to a knockout in an outlet box or enclosure.

Locknuts for Plastic Conduit Fittings

Secure threaded plastic conduit fittings to a knockout in an outlet box or enclosure.

Flexible Conduit and Fittings

Adapters for Flexible Metal
Conduit and Armored Cable

Attach conduit and armored cable to a knockout in an outlet box or enclosure.

Adapters for Flexible Metal Conduit

Attach conduit to a knockout in an outlet box or enclosure.

Adapters for Flexible Plastic Conduit

Attach conduit to a knockout in an outlet box or enclosure.

Adapters for Choose-a-Color
Flexible Plastic Conduit

Attach conduit to a knockout in an outlet box or enclosure.

Fittings for Liquid-Tight Flexible Metal Conduit

These fittings seal out liquids when connecting liquid-tight flexible metal conduit to a knockout in an outlet box or enclosure.

Adapters for Liquid-Tight Flexible Plastic Conduit

Attach conduit to a knockout in an outlet box or enclosure.

Fittings for Shielded Flexible Plastic Conduit

These adapters provide electromagnetic interference (EMI) protection when connecting shielded flexible plastic conduit to a knockout in an outlet box or enclosure.

Continuous-Flex Conduit and Fittings

Fittings for Continuous-Flex Plastic Conduit

One end twists into a piece of conduit for a quick connection; the other end attaches to a knockout in an outlet box or enclosure.

Fittings for Continuous-Flex
Liquid-Tight Plastic Conduit

These fittings seal out liquid when used with continuous-flex liquid-tight plastic conduit.

About Conduit

Conduit and Fittings

Reducing Washers for Medium-Wall (IMC)and Thick-Wall (Rigid) Steel Conduit

Raintight Reducing Washers for Medium-Wall(IMC) and Thick-Wall (Rigid) Steel Conduit

Adapters for Medium-Wall (IMC)and Thick-Wall (Rigid) Steel Conduit

Connectors for Medium-Wall (IMC)and Thick-Wall (Rigid) Steel Conduit

Adapters for Rigid PVC Conduit

Adapters for Rigid Stainless Steel Conduit

Hazardous Location Conduit Adapters

Adapters for Rigid Aluminum Conduit

Adapters for Thin-Wall (EMT) Steel Conduit

Adapters for Thin-Wall (EMT)Stainless Steel Conduit

Adapters for Choose-a-ColorThin-Wall (EMT) Steel Conduit

Conduit Fitting Locknuts

Locknuts for Metal Conduit Fittings

Locknuts for Plastic Conduit Fittings

Flexible Conduit and Fittings

Adapters for Flexible MetalConduit and Armored Cable

Adapters for Flexible Metal Conduit

Adapters for Flexible Plastic Conduit

Adapters for Choose-a-ColorFlexible Plastic Conduit

Fittings for Liquid-Tight Flexible Metal Conduit

Adapters for Liquid-Tight Flexible Plastic Conduit

Fittings for Shielded Flexible Plastic Conduit

Continuous-Flex Conduit and Fittings

Fittings for Continuous-Flex Plastic Conduit

Fittings for Continuous-FlexLiquid-Tight Plastic Conduit

Reducing Washers for Medium-Wall (IMC)
and Thick-Wall (Rigid) Steel Conduit

Raintight Reducing Washers for Medium-Wall
(IMC) and Thick-Wall (Rigid) Steel Conduit

Adapters for Medium-Wall (IMC)
and Thick-Wall (Rigid) Steel Conduit

Connectors for Medium-Wall (IMC)
and Thick-Wall (Rigid) Steel Conduit

Adapters for Thin-Wall (EMT)
Stainless Steel Conduit

Adapters for Choose-a-Color
Thin-Wall (EMT) Steel Conduit

Adapters for Flexible Metal
Conduit and Armored Cable

Adapters for Choose-a-Color
Flexible Plastic Conduit

Fittings for Continuous-Flex
Liquid-Tight Plastic Conduit