Mulberry 30290 Threaded Slotted Round Closure Plug, Zinc Die-Cast, 1/2-Inch

Mulberry 30290 Threaded Slotted Round Closure Plug, Zinc Die-Cast, 1/2-Inch

The Mulberry 30290 Round Threaded Slotted Closure Plug is a die-cast zinc fitting engineered to seal unused 1/2-Inch conduit openings and knockouts in electrical enclosures and boxes, and is available in Bronze and Gray finishes to complement the surrounding installation. Its round, threaded body drives in with a standard slotted head, allowing quick installation and removal with a common flat-blade screwdriver, while the zinc die-cast construction delivers the strength and corrosion resistance electrical contractors expect from a quality closure plug. Use the 30290 to maintain a clean, protected enclosure whenever a knockout or threaded opening is not currently in service, and back it out again later if that opening needs to be put back into use.

Key Features

• Trade Size: Sized 1/2-Inch to fit standard conduit knockouts and threaded openings in electrical enclosures and boxes.
• Durable Construction: Zinc die-cast body resists corrosion and holds up to repeated installation and removal in the field.
• Threaded, Slotted Design: Round threaded body with a slotted head installs and backs out quickly using a standard flat-blade screwdriver.
• Closure Function: Seals unused conduit openings and knockouts to keep enclosures clean, protected, and free of debris intrusion.
• Round Profile: Low-profile round head sits flush against the enclosure surface for a neat, finished appearance.
• Color Options: Available in Bronze and Gray to complement the finish of the enclosure or panel.
• Reusable Design: Threaded engagement allows the plug to be removed and reinstalled if the sealed opening is later needed for conduit entry.

Technical Specifications

• Product Material: Zinc Die-Cast
• Trade Size: 1/2-Inch
• Color Options: Bronze, Gray

Typical Applications

• Electrical Enclosure and Panel Knockout Sealing
• Conduit System Closures
• Junction and Switch Box Closures
• Commercial and Industrial Electrical Installations
• Service Equipment and Panelboard Openings
• Renovation and New Construction Wiring Projects

Why Mulberry?

Mulberry builds electrical fittings like the 30290 closure plug from zinc die-cast material for long-term durability in demanding installation environments, and offers it in Bronze and Gray to fit the look of the surrounding enclosure. Choosing a properly sized, correctly threaded closure plug helps keep every enclosure clean, protected, and code-compliant, whether it is used on a new installation or during a service upgrade. Shop Mulberry electrical fittings at ZenSupply for reliable, well-made components trusted by electrical professionals on commercial and industrial jobs.