Ag Manufacturing 419 Knockout Seal 4 Inches 3 Piece Steel

Product Description

The AG Manufacturing 419 is a 3-piece knockout seal with a screw back strap, designed to close and secure unused knockout openings in electrical enclosures, junction boxes, and conduit fittings. Constructed from stamped steel, it provides a durable, code-acceptable closure that resists deformation under normal service conditions. The screw back strap design locks the seal firmly in place without requiring additional hardware. Sized for 4-inch knockouts, this seal is a standard utility item found in electrical and mechanical rough-in work across residential and commercial applications.

This knockout seal is used wherever an unused 4-inch knockout must be closed to maintain enclosure integrity and meet inspection requirements. Common applications include electrical panels, pull boxes, junction boxes, and equipment cabinets. It is installed by licensed electricians and experienced tradespeople during new construction, renovation, and service work. The 3-piece assembly accommodates standard knockout geometries and is stocked as a routine consumable on most electrical service vehicles.

Key Features

• Fits 4-inch knockout openings in electrical enclosures and boxes
• 3-piece design with integrated screw back strap for secure fastening
• Stamped steel construction for durability in typical enclosure environments
• Closes unused knockouts to satisfy NEC enclosure integrity requirements
• No additional hardware required for installation

Compatibility

Designed as an OEM-style replacement and standard-fit closure for 4-inch knockout openings in electrical enclosures, junction boxes, and similar metal or steel cabinet applications.

Installation Notes

Installation is performed by a licensed electrician. De-energize the panel or enclosure and verify lockout/tagout procedures are followed before opening any electrical enclosure. Insert the seal into the knockout opening and tighten the back strap screw to clamp the seal securely against the enclosure wall. Verify the opening is fully covered and the seal is flush before returning the enclosure to service.

Technical Specifications

• Knockout Size: 4 inches
• Pieces per Set: 3
• Material: Stamped Steel
• Fastening Method: Screw Back Strap
• UPC: 780730004195

Standard Information

• Brand: AG Manufacturing
• Manufacturer Part Number: 419