SEPCO SS48 3-Piece Flat Knockout Seal, Zinc-Plated Steel

SEPCO SS48 3-Piece Flat Knockout Seal, Zinc-Plated Steel

The SEPCO SS48 is a 3-piece flat knockout seal built from zinc-plated steel, engineered to close unused knockout openings in electrical panelboards, enclosures, and boxes. This family of knockout seals is available in trade sizes ranging from 2-1/2" to 4", covering the most common knockout openings found on panelboards and enclosures. The zinc-plated finish delivers dependable corrosion resistance for long-term performance in professional electrical installations, while the low-profile flat design keeps dust, moisture, and debris away from internal wiring and components. Electricians and maintenance crews rely on knockout seals like the SEPCO SS48 to keep panelboards and boxes code-ready whenever a knockout is removed but not put into immediate use.

Key Features

• Trade Size Range: Available in 2-1/2", 3", and 4" trade sizes to fit a range of unused knockout openings.
• Durable Construction: Zinc-plated steel construction resists corrosion and supports long-lasting performance in typical indoor and outdoor electrical environments.
• 3-Piece Design: The three-piece configuration allows for straightforward installation and a secure, flush fit over unused knockout openings, without requiring specialty tools.
• Flat, Low-Profile Seal: The flat seal profile sits flush against the enclosure surface for a clean, finished appearance without obstructing surrounding components or wiring.
• Knockout Seal Function: Effectively closes unused knockout holes in panelboards, boxes, and enclosures, helping protect internal wiring, terminations, and components from contaminants.
• Finish: The zinc-plated finish adds an extra layer of corrosion resistance for demanding job-site conditions and long-term outdoor or damp-area exposure.
• Steel Build: Solid steel base construction provides the rigidity needed for a secure, lasting seal over standard knockout openings.

Technical Specifications

• Trade Size: 2-1/2" - 4"

Typical Applications

• Electrical Panelboards and Enclosures
• Conduit and Raceway Systems
• Commercial and Industrial Electrical Installations
• Electrical Contractor Job Sites
• Renovation and New Construction Projects

Why SEPCO?

SEPCO knockout seals are built from zinc-plated steel for dependable corrosion resistance in everyday electrical work. Offered in 2-1/2" through 4" trade sizes, the 3-piece flat design offers a practical, easy-to-install solution for closing unused knockouts while helping keep enclosures protected from dust, moisture, and debris. SEPCO's straightforward, no-frills construction makes this seal a reliable choice for electricians and facility maintenance teams who need dependable components for professional, code-compliant electrical projects.