Standard GI 1 Inch Threaded Plug, Galvanized Malleable Iron

GI Threaded Plug

The Standard GI 1 Inch Plug provides a reliable, high-pressure seal for terminating pipe runs in water, gas, and steam distribution systems. Manufactured from high-grade malleable iron and treated with a protective zinc coating, this fitting ensures long-term durability in both residential and industrial plumbing environments. It features precision-cut male threads designed to integrate seamlessly with standard DN25 galvanized piping networks.

Built for the Job

Plumbers and site supervisors rely on this heavy-duty component for capping off main lines during pressure testing or for permanent closure of unused outlets. The malleable iron construction allows the fitting to withstand significant mechanical stress and internal pressure without cracking, making it superior to standard cast iron alternatives. This specific size is a staple in municipal water connections and agricultural irrigation setups where robust hardware is mandatory. The hot-dip galvanization process creates a thick barrier against oxidation, allowing the unit to perform effectively in damp crawl spaces, outdoor exposed runs, or underground installations.

• Sealing manifold outlets in commercial water heating systems.

• Terminating gas lines during building renovations or extensions.

• Pressure testing new pipe installations to detect leaks before commissioning.

Product Highlights

Malleable Iron Strength

The base metal provides high tensile strength and resistance to thermal expansion cycles common in steam applications.

Hot-Dip Galvanized Coating

• Uniform zinc layer prevents rust and corrosion in high-moisture areas.
• Resistant to chemical degradation from treated municipal water supplies.

Technical Specifications

What’s Included

• 1 x 1-Inch Galvanized Iron Threaded Plug

On-Site & Workshop Notes

• Apply industrial-grade PTFE tape or pipe joint compound to the threads before installation to ensure a gas-tight seal.

• Use a pipe wrench of appropriate size to avoid marring the galvanized surface during tightening.

• Inspect threads for debris or metal shavings before assembly to prevent cross-threading with the female port.

• Store these iron fittings in a dry area to maintain the integrity of the zinc coating before site use.