3/4 inch Galvanized Iron Union Female x Female

3/4” Galvanized Iron Union – Threaded Female x Female for Mechanical and Plumbing Systems

The 3/4” galvanized iron union is a heavy-duty fitting used to join two sections of threaded steel piping while allowing for disconnection and maintenance. Engineered for use in pressurized water, air, and non-corrosive fluid systems, this union provides structural integrity and ease of service in both residential and light commercial applications.

It features a galvanized zinc coating applied over malleable iron, enhancing resistance to corrosion in humid and exposed environments. Threaded ends conform to ANSI/ASME B1.20.1 NPT specifications, ensuring compatibility with standard iron pipe connections.

Key Product Features

• ✅ Threaded FIP Connections: Precision-machined NPT threads for dependable sealing and torque strength.
• ✅ Galvanized Coating: Hot-dip zinc layer improves corrosion resistance in potable and non-potable water systems.
• ✅ Union Nut Assembly: Allows for convenient system disassembly without pipe rotation, ideal for service points and pump transitions.
• ✅ Mechanical Durability: Malleable iron body rated for working pressures typical of domestic and hydronic systems.
• ✅ Industry Standard Compliance: Designed in accordance with ASTM A197 and ANSI/ASME B16.3 for dimensional consistency and pressure integrity.

Technical Specifications

• Size: 3/4 inch nominal pipe size
• Connection: Female NPT x Female NPT
• Material: Galvanized malleable iron
• Pressure Rating: Suitable for systems up to 150 psi non-shock water pressure
• Standards: ANSI/ASME B16.3, B1.20.1, ASTM A153 zinc coating

Typical Applications

This union is commonly used in threaded steel piping networks for:

• Potable water distribution lines
• Hydronic heating loops
• Low-pressure steam piping (non-condensing)
• General-purpose air or fluid lines in maintenance systems

Installation Considerations

Unions must be properly tightened to prevent vibration loosening. Always use thread sealant or PTFE tape rated for metal piping. Avoid overtightening to protect threads. It is recommended to perform a pressure test after installation to verify sealing integrity.

Note:

Galvanized iron is not suitable for combustible gas applications and should not be used in high-corrosion chemical systems. For potable systems, confirm local code acceptance of galvanized iron in domestic water distribution lines.

The 3/4” galvanized union provides a practical solution for serviceable piping joints in rigid piping systems. Designed for repeat access and consistent sealing performance, it is a reliable component for professional plumbing and mechanical installations.