From steel snap-in blanks to plastic bushings and pull caps, these products help ensure safe, professional, and code-conscious electrical work.
- Seal unused knockout openings
- Protect wires from sharp metal edges
- Maintain enclosure integrity
- Available in steel and plastic options
- Multiple sizes for standard trade knockouts
Complete Solutions for Knockout Protection & Wire Safety
Electrical enclosures often include multiple knockouts to allow for conduit entry and cable routing. When a knockout is unused, it must be properly sealed. When conductors pass through metal openings, they must be protected from abrasion. Bushings and knockout plugs play a critical role in meeting these needs.
This parent category organizes all of our knockout closure and wire protection solutions into easy-to-navigate sub-collections, so you can quickly find the exact component required for your project.
Explore Sub-Collections
- Steel Snap-In Blanks – Durable steel caps that snap into unused knockout openings for a clean, professional finish.
- Type S with Screw & Bar Knockout Seals – Heavy-duty knockout seals that fasten securely using a screw and backing bar for added strength and vibration resistance.
- Polypropylene Stud Bushings – Designed to protect conductors when passing through metal studs, reducing abrasion and preventing wire damage.
- Plastic Knockout Plugs – Lightweight closure plugs for sealing unused openings in electrical boxes and panels.
- Plastic Knockout Plugs – Snap In – Quick-install snap-fit plastic plugs for fast jobsite closure of unused knockouts.
- Plastic Pull Caps – Protective caps used to temporarily seal or protect conduit and tubing ends during installation or transport.
- Snap Bushings – Flexible inserts that snap into panel holes to protect wires and cables from sharp edges.
- Snap Bushings with Shutters – Advanced snap bushings featuring closing shutters to provide added dust protection when not in use.
- Snap Bushings (Open/Closed) – Versatile bushings available in open or closed styles to match your wiring configuration.
Why Bushings & Knockout Plugs Matter
Unused openings in electrical enclosures can allow debris, dust, and accidental contact with internal components. Similarly, unprotected metal edges can damage insulation on conductors, creating potential safety hazards. Installing the proper bushing or knockout plug ensures:
- Safer conductor routing
- Improved enclosure protection
- Professional appearance
- Compliance with electrical installation best practices
Steel vs. Plastic – Choosing the Right Option
Steel knockout blanks are typically preferred for durability and strength in commercial or industrial environments. Plastic options provide corrosion resistance, lightweight installation, and fast snap-in convenience for many standard applications. Selecting the correct material depends on the installation environment, enclosure type, and project requirements.
Available in Multiple Trade Sizes
Products within this category are available in a range of standard trade sizes to match common knockout dimensions, including 1/2", 3/4", 1", 1-1/4", 1-1/2", 2", and larger sizes depending on the product type.
Need Help Selecting the Right Bushing or Plug?
If you’re unsure which knockout plug or bushing is correct for your application, our team is ready to assist. Contact us with your enclosure type, knockout size, and installation details, and we’ll help you choose the proper solution.
