3 inch x 2-1/2 inch Black Iron Reducing Coupling Female x Female

3" x 2-1/2" Black Malleable Iron Reducing Coupling – Threaded Fitting for High-Integrity Pipe Connections

The 3" x 2-1/2" Black Malleable Iron Coupling is a reducing fitting engineered for connecting pipes of different diameters in threaded piping systems. Manufactured from ASTM A197 malleable iron, this coupling offers a durable and corrosion-resistant solution for natural gas, steam, air, or water distribution lines in both commercial and industrial environments.

Designed for performance in high-pressure applications, this coupling provides a reliable female-to-female NPT connection. The reduction from 3" to 2-1/2" allows for efficient transitions while maintaining system integrity in installations where flow adaptation is required.

Key Specifications

• Material: Black Malleable Iron (ASTM A197)
• Size: 3" x 2-1/2"
• Connection Type: Threaded NPT Female x Female
• Pressure Rating: Up to 300 PSI (depending on application)
• Standards: Threads conform to ANSI B1.20.1; fitting dimensions follow ASME B16.3
• Surface Treatment: Black iron finish suitable for non-potable applications

Performance Features

• Thread Integrity: Precisely machined NPT threads provide secure, leak-resistant joints when installed with approved sealants
• Thermal Tolerance: Suitable for high-temperature service in heating or steam systems
• High Strength: Malleable iron construction delivers structural resilience for use in pressurized piping networks
• Flow Efficiency: Smooth internal casting reduces turbulence and supports consistent fluid movement

Common Applications

• Fuel gas systems (natural gas, propane)
• Hydronic heating networks
• Low-pressure steam distribution
• Oil, air, or water transfer lines
• Industrial plant utilities and mechanical rooms

Installation Notes

This reducing coupling is intended for use with schedule 40 or schedule 80 threaded pipe. Apply pipe dope or PTFE tape rated for the service media. Proper alignment and torque are critical to maintaining system pressure ratings and preventing joint fatigue. For vertical transitions or complex layouts, verify support spacing and use structural hangers as needed.

Did You Know?

Black malleable iron is commonly selected for gas and oil piping due to its dimensional stability under thermal cycling and its high tensile strength, making it ideal for long-term mechanical integrity.

The 3" x 2-1/2" Black Malleable Iron Coupling is a reliable transition fitting for professional contractors working on complex mechanical systems. Built to specification and ready for use in high-demand environments, this fitting delivers performance you can rely on job after job.