Bell CP4100S Weatherproof Metal Closure Plug, 1 in. NPT, Gray, 4-Pack

Bell Weatherproof Metal Closure Plug, 1 in. NPT, Gray, 4-Pack

The Bell weatherproof metal closure plug is designed to seal unused 1 in. NPT conduit openings and hub knockouts on electrical enclosures, boxes, and fittings. Molded from durable metal and finished in gray, this closure plug threads directly into a 1 in. NPT opening to keep out moisture, dust, and debris when a conduit entry is not in use. Each package includes a convenient polybag of 4 plugs, making it easy to stock multiple closures for service work, panel modifications, or new installations. This economical closure plug is a practical accessory for electrical contractors, panel shops, and maintenance teams working with 1 in. NPT enclosures and conduit bodies.

Key Features

• Trade Size: 1 in. NPT threading fits standard 1 in. conduit hubs and enclosure knockouts.
• Durable Construction: Weatherproof metal body stands up to outdoor exposure and everyday jobsite handling.
• NPT Threaded Connection: Threads directly into a 1 in. NPT opening for a secure, weatherproof seal against moisture and debris.
• Gray Finish: Neutral gray finish blends with common weatherproof enclosures and conduit fittings.
• Convenient Multi-Pack: Sold in a polybag of 4, giving electricians and maintenance crews enough plugs on hand for multiple closures in one purchase.
• Weatherproof Design: Rated weatherproof for outdoor conduit and enclosure applications where moisture protection matters.

Certifications & Compliance

• Weatherproof Rated for Outdoor and Wet-Location Use

Technical Specifications

• Product Color: Gray
• Product Depth: 0.33 in

Typical Applications

• Sealing Unused Conduit Openings and Hub Knockouts
• Weatherproof Electrical Enclosures and Boxes
• Outdoor and Wet-Location Conduit Systems
• Commercial and Industrial Electrical Installations
• Panel and Enclosure Renovation or Retrofit Work
• New Construction Electrical Rough-In

Why Bell?

Bell closure plugs are built from weatherproof metal to give electrical contractors a dependable way to seal off unused conduit entries and keep enclosures protected from the elements. The 1 in. NPT threading ensures a tight, direct fit into standard hubs, and the gray finish keeps sealed openings looking clean and professional. Packaged in a convenient polybag of 4, this Bell closure plug makes it simple to keep the right closures on hand for reliable, code-conscious electrical work. By stocking Bell closure plugs, crews can respond quickly to field changes without leaving conduit hubs exposed.