Ag Manufacturing 417 Knockout Seal 3 Inch Stamped Steel 3-piece

Product Description

The AG MANUFACTURING 417 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 panels. Constructed from stamped steel, this seal provides a durable, low-profile cover that keeps the interior of the enclosure protected from debris, moisture, and accidental contact. The screw back strap design locks the seal firmly in place without special tooling. Sized at 3 inches, it fits standard 3-inch knockouts common in residential and light commercial electrical installations. Electricians and panel installers use this fitting as a standard code-compliance closure when a conduit entry is not needed.

The 417 knockout seal is suited for use in residential and commercial electrical panel work, junction boxes, meter bases, and other metal enclosures where open knockouts must be closed per NEC requirements. The 3-piece assembly includes the seal, a back strap, and a fastening screw, making it a self-contained closure solution. It is a common stock item for electricians performing panel trim-out, box rough-in, or service upgrades where unused knockouts are present.

Key Features

• Stamped steel construction for durability in enclosure and panel applications
• Screw back strap design secures the seal without requiring specialty tools
• 3-piece kit includes seal, back strap, and fastening hardware
• 3-inch size fits standard 3-inch knockout openings
• Low-profile fit keeps enclosure interiors protected from debris and contact

Compatibility

Designed as an OEM-style replacement and standard-stock closure for 3-inch knockout openings in residential and commercial electrical enclosures, junction boxes, and panel cabinets.

Installation Notes

Installation is performed by a licensed electrician. De-energize and lock out the panel or enclosure before beginning work, in accordance with NFPA 70 (NEC) lockout/tagout requirements. Insert the seal through the knockout opening, position the back strap on the interior side, and tighten the fastening screw until the seal seats firmly against the enclosure wall. Do not overtighten to the point of deforming the stamped steel body.

Technical Specifications

• Knockout Size: 3 inches
• Material: Stamped Steel
• Pieces per Set: 3
• UPC: 780730004171

Standard Information

• Brand: AG MANUFACTURING
• Manufacturer Part Number: 417