1 inch Galvanized Iron Union Female x Female

1" Galvanized Malleable Iron Union – Female x Female NPT

The 1" galvanized malleable iron union (FxF) is engineered for permanent, yet serviceable connections in threaded piping systems. Manufactured from ASTM A197 malleable iron and hot-dip galvanized to ASTM A153 standards, this union is ideal for general plumbing, mechanical, and low-pressure process applications where corrosion resistance and mechanical strength are critical.

The union allows for disassembly without disturbing the piping on either side, making it especially valuable in systems requiring routine maintenance or component replacement. With female National Pipe Tapered (NPT) threads on both ends, it ensures compatibility with a wide range of steel or brass male-threaded pipe and fittings.

Key Features

• ✅ Galvanized Coating – Zinc coating provides superior resistance to rust and corrosion in damp or exterior environments
• ✅ Three-Piece Design – Consists of two female ends and a center nut for easy disassembly and alignment
• ✅ Precisely Cut NPT Threads – Threads meet ASME B1.20.1 standards for pressure-tight sealing
• ✅ Pressure Rated – Suitable for working pressures up to 300 psi for water, oil, and non-steam air systems
• ✅ Machined Mating Surfaces – Ensure a tight seal between union halves, minimizing the risk of leakage over time

Technical Specifications

• Material: ASTM A197 Malleable Iron
• Finish: Hot-dip galvanized to ASTM A153
• Nominal Size: 1 inch
• Thread Type: NPT, Female x Female (ASME B1.20.1)
• Max Pressure: 300 psi (non-steam applications)
• Conformance: ANSI/ASME B16.3, UL/CSA/NSF listings where applicable

Typical Applications

This galvanized union is frequently used in:

• Potable and non-potable water distribution systems
• Low-pressure industrial process lines
• Maintenance-critical assemblies such as water heaters, filters, and valve banks
• Transition points in gas, HVAC, or mechanical system runs (when used per code)

Best Practices

Use PTFE tape or compatible thread sealant on male threads during installation. Do not overtighten the union nut to preserve sealing surfaces and thread integrity. For systems exposed to corrosive atmospheres, verify galvanization thickness and install in accordance with local code.

Compliance and Performance

Galvanized malleable iron unions remain a preferred option in mechanical and plumbing trades due to their field-serviceable nature and structural integrity. This fitting is designed for long-term performance in harsh and high-demand environments.

Choose the 1" Galvanized Iron Union when a reliable, corrosion-resistant, and easily serviceable joint is required. Trusted across the trade for field repairs and modular systems alike.