Hoffman AS100-AS300 Hol-Sealers Steel Hole Seal, 1" to 3"

Hoffman AS100 Hole Seal Plug for Electrical Enclosures

The Hoffman AS100 Hole Seal is a purpose-built hole sealer designed to close off unused openings, cutouts, and knockouts in electrical enclosures, panels, and equipment housings. Identified by its HOL-SEALERS HOLE SEAL designation, the AS100 provides a simple, reliable way to restore the integrity of an enclosure wall once a hole is no longer needed for conduit entry, wiring, or hardware mounting. Electrical contractors and panel builders rely on hole seals like the AS100 to maintain a clean, finished enclosure interior and to help keep out dust, debris, and unwanted intrusion through openings that would otherwise remain exposed.

Key Features

• Hole Sealing Function: Engineered specifically to plug and seal unused holes, cutouts, and knockouts in electrical enclosures and panel walls.
• Hoffman Build Quality: Manufactured by Hoffman, a recognized name in enclosure and panel accessory hardware for industrial and commercial electrical work.
• Simple Installation: Designed as a straightforward, install-in-place hole seal that does not require special tools for placement into an existing opening.
• Clean Finished Appearance: Helps restore a neat, professional look to an enclosure once a knockout or hole is no longer required.
• Enclosure Protection: Helps reduce the entry path for dust and debris through an unused opening in the enclosure wall.
• Model AS100: Part of the Hoffman HOL-SEALERS hole seal product line, identified under model designation AS100.

Technical Specifications

• Model: AS100
• Product Line: Hoffman HOL-SEALERS
• Refer to manufacturer documentation for complete dimensional and material specifications.

Typical Applications

• Sealing Unused Knockouts in Electrical Enclosures
• Closing Off Redundant Cutouts After Panel Modifications
• Finishing Enclosure Walls in Industrial and Commercial Panel Builds
• Maintenance and Retrofit Work Where Openings Are No Longer Needed
• General Enclosure Housekeeping in Electrical Rooms and Equipment Rooms

Why Hoffman?

Hoffman is an established supplier of enclosure hardware and accessories used throughout industrial and commercial electrical installations. The AS100 Hole Seal reflects that same practical, purpose-built approach, offering electrical professionals a dependable way to close unused openings and keep enclosures organized and protected. Choosing a Hoffman hole seal means choosing a component made to work seamlessly within the broader Hoffman enclosure ecosystem for panel builders and maintenance teams alike.