Greenlee K3BB 2 1/2" Knockout Plug Seal

Greenlee K3BB 2 1/2" Knockout Plug Seal

The Greenlee K3BB is a 2 1/2" knockout plug designed to seal unused knockout openings in electrical enclosures, panelboards, junction boxes, and wireways. Sized to match a standard 2 1/2" knockout, this fitting closes off an opening left after a knockout has been removed but is not being used for conduit entry, helping maintain the integrity of the enclosure. Electricians and contractors rely on properly sized knockout plugs like the K3BB to keep panel and box openings sealed and code-compliant during rough-in and service work.

Key Features

• Trade Size: Engineered to fit a 2 1/2" knockout opening in electrical panels, boxes, and enclosures.
• Purpose-Built Fit: Matches standard 2 1/2" knockout dimensions for a secure, snug installation without gaps.
• Enclosure Sealing: Closes unused knockout openings to help maintain the protective integrity of the enclosure.
• Simple Installation: Designed for quick placement into the knockout opening during panel or box assembly.
• Greenlee Reliability: Manufactured by Greenlee, a trusted name in electrical tools and installation hardware for professional trade use.

Technical Specifications

• Size: 2 1/2"
• Product Type: Knockout Plug
• Brand: Greenlee

Typical Applications

• Sealing Unused Knockouts in Electrical Panels
• Junction Box and Enclosure Finishing
• Panelboard and Load Center Assembly
• Commercial and Industrial Electrical Installations
• New Construction and Renovation Wiring Projects

Why Greenlee?

Greenlee is a recognized manufacturer of electrical installation tools and hardware relied on by professional electricians. The K3BB knockout plug reflects Greenlee's focus on precision-fit components that help contractors finish panel and enclosure installations cleanly and correctly. Choosing a properly sized Greenlee knockout plug helps keep electrical enclosures sealed and ready for inspection.