The NESCO KO54 is a snap-in steel knockout plug built for professional electricians and contractors who need a fast, reliable way to seal unused 1-1/2" trade knockouts in electrical boxes, panels, and enclosures. Designed for quick installation without tools, this plug snaps firmly into place to create a secure, dust-tight barrier — keeping your rough-in work clean and code-compliant on any job site. Whether you're finishing a service panel, sealing a junction box, or closing off unused conduit entries during a renovation, the KO54 delivers consistent performance in dry location applications.

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