Morris Products 21800, Steel Snap-In Blanks 1/2", Use to Close Off Unused Openings in Boxes and Panel Boards

Steel Snap-In Blank – 1/2" Knockout Closure (Morris 21800)

This 1/2" steel snap-in blank is designed to close off unused knockout openings in metal electrical boxes, panelboards, and enclosures. It installs quickly with a snap-fit design—no screws, locknuts, or extra hardware—creating a clean, professional finish while helping protect the enclosure from dust and debris.

Key Features

• Use: Closes unused 1/2" trade size knockout openings in boxes and panelboards
• Material: All-steel construction for durability and installation integrity
• Design: Snap-fit retention clips for fast, secure installation
• Finish: Metallic steel finish suitable for standard electrical enclosures
• Application: Commercial, industrial, and residential electrical work

Where It’s Commonly Used

• Junction and outlet boxes
• Load centers and panelboards
• Metal enclosures and cabinets
• Service equipment and control panels

How It Works

After confirming the knockout is the correct 1/2" trade size, align the blank with the opening and press it into place until the spring tabs lock around the edge. Once installed, the knockout is safely closed for a neat, finished appearance.

Quick Notes

• Trade size matters: Match the blank to the knockout’s trade size (1/2"), not the measured hole diameter.
• For metal enclosures: Ideal for standard steel boxes and panels where unused openings must be properly closed.