1-1/4 inch x 3/4 inch Black Iron Reducing Coupling Female x Female

1-1/4 inch x 3/4 inch Black Malleable Iron Reducing Coupling – Threaded FNPT x FNPT

The 1-1/4 inch x 3/4 inch Black Iron Reducing Coupling is a malleable iron fitting used for transitioning between two nominal pipe sizes within threaded Schedule 40 or Schedule 80 piping systems. It features female NPT threads on both ends and is designed for applications involving natural gas, steam, air, and low-pressure fluid systems.

Manufactured to meet ASTM A197 and conforming to ASME B16.3 and B16.14 dimensional standards, this coupling is suitable for use in commercial and industrial systems requiring reliable, mechanical strength in corrosive- and heat-resistant environments. The black iron finish is suited for indoor, non-potable applications where external coating is not required.

Performance Characteristics

• ✅ Threaded FNPT x FNPT Design Compatible with ANSI/ASME B1.20.1 tapered threads for secure mechanical connections.
• ✅ Cast Malleable Iron Provides high tensile strength, shock resistance, and deformation tolerance in high-vibration systems.
• ✅ Reducing Configuration Efficiently joins 1-1/4 inch pipe to 3/4 inch pipe without the need for additional bushings or adapters.
• ✅ Black Finish Intended for use in low-pressure gas and air systems not exposed to moisture or outdoor elements.
• ✅ Code Compliance Manufactured in accordance with industry standards for threaded malleable iron fittings.

Technical Specifications

• Material: Malleable Iron (ASTM A197)
• Nominal Sizes: 1-1/4 inch x 3/4 inch
• Connection Type: FNPT x FNPT
• Standards: ASME B16.3, ASME B16.14, ANSI/ASME B1.20.1

Typical Applications

This reducing coupling is frequently installed in gas distribution piping, hydronic heating systems, air compressor lines, and mechanical piping layouts where a change in pipe diameter is required. It is well-suited for use in both residential and commercial installations where threaded steel pipe is used.

Installation Guidance

Apply PTFE tape or thread sealant on male threads prior to assembly. Avoid over-tightening to prevent thread distortion. Ensure alignment to reduce mechanical stress at the joint and follow local code requirements for pressure-rated pipe assemblies.

The 1-1/4 inch x 3/4 inch Black Malleable Iron Reducing Coupling provides a durable, pressure-rated connection in systems requiring size transition without compromising sealing integrity or mechanical strength.