2 inch x 1 inch Black Iron Reducing Coupling Female x Female

2 Inch x 1 Inch Black Iron Reducing Coupling – FNPT x FNPT Threaded Fitting for Pipe Size Transitions

The 2 inch x 1 inch Black Iron Reducing Coupling Female x Female is a threaded fitting designed to join two pipes of differing diameters within a gas, oil, steam, or water system. Manufactured for use in low- to medium-pressure applications, this coupling enables system designers and installers to reduce pipe size in confined layouts without compromising mechanical integrity.

Constructed from malleable black iron, this coupling provides excellent tensile strength and resistance to deformation under load, making it suitable for systems where dimensional transitions are required in a durable, corrosion-resistant housing.

Key Performance Features

• ✅ Threaded Connections – FNPT ends are machined to ANSI/ASME B1.20.1 standard thread specifications for compatibility with steel, brass, and other threaded metal pipe materials.
• ✅ Black Iron Material – Offers strength, impact resistance, and dimensional stability in both aboveground and concealed piping systems.
• ✅ Step-Down Design – Reduces 2 inch nominal pipe to 1 inch in a compact coupling body, avoiding the need for multiple fittings.
• ✅ Corrosion-Resistant Finish – The black oxide coating provides a degree of protection from surface corrosion in dry environments.

Installation Considerations

Use thread sealant or PTFE tape to ensure a leak-tight joint. Connections should be tightened with a pipe wrench and inspected for thread engagement and proper alignment. Avoid over-torquing, which can damage threads or distort fitting bodies. Suitable for both vertical and horizontal system orientations in rigid pipe assemblies.

Applications

This reducing coupling is used in mechanical systems requiring a reduction from 2 inch to 1 inch nominal pipe diameter, such as branch lines, appliance supply lines, or where component limitations dictate smaller inlets or outlets. Frequently installed in HVAC systems, fuel gas piping, industrial plumbing, and hydronic heating loops.

Compliance and Use Notes

Black iron fittings are commonly specified for gas and oil systems and are generally not approved for potable water unless explicitly rated. Always consult local code requirements and project specifications for permitted use in pressure-rated systems.

Technical Specifications

• Material: Black Malleable Iron
• Size: 2 in. x 1 in.
• End Connection: Female National Pipe Thread (FNPT) x FNPT
• Standards: Complies with ASME B16.3 and ASTM A197 (material composition)

The 2 inch x 1 inch Black Iron Reducing Coupling offers a code-compliant and mechanically secure solution for connecting pipes of unequal size. Its compact design and robust construction support long-term system performance in fuel gas, steam, and other non-potable systems.