Sigma 811092618 Pipe Reducing Coupling 4x3 in 150 Lb Galvanized

Product Description

The SIGMA 811092618 is a galvanized malleable iron pipe reducing coupling rated at 150 lb, designed to connect pipes of two different nominal diameters in a straight run. The coupling transitions from a 4-inch nominal pipe to a 3-inch nominal pipe, making it a reliable choice for reducing flow path diameter without the need for additional fittings. The galvanized finish provides corrosion resistance suitable for a wide range of piping environments. Licensed plumbers and pipefitters install this type of fitting in both new construction and retrofit work where pipe size changes are required along a run.

This reducing coupling is suited for residential and commercial plumbing, water distribution, and general industrial piping systems where malleable iron threaded fittings are specified. The 150 lb pressure rating meets standard service requirements for water, steam, and air piping applications. It is a threaded fitting, intended for use where NPT-threaded pipe connections are required and where galvanized iron is the appropriate material for the service environment.

Key Features

• Reduces from 4-inch nominal to 3-inch nominal pipe in a single straight fitting
• 150 lb pressure rating suitable for water, steam, and air service
• Malleable iron construction provides strength and impact resistance
• Galvanized finish resists corrosion in wet and outdoor environments
• Threaded NPT connections for standard installation with pipe wrenches

Compatibility

Designed as an OEM-style replacement or new-installation fitting for 4-inch to 3-inch nominal threaded pipe systems using standard 150 lb malleable iron fittings.

Installation Notes

Installation is performed by licensed plumbers or pipefitters in accordance with applicable local plumbing codes and ASME B16.3 standards for malleable iron threaded fittings. Shut off and depressurize the piping system completely before removing or installing any fitting. Apply thread sealant or PTFE tape to the male NPT threads before assembly, and tighten with appropriate pipe wrenches to achieve a leak-free joint. Do not over-torque, as malleable iron threads can be damaged by excessive force.

Technical Specifications

• Nominal Size: 4 x 3 inches
• Pressure Rating: 150 lb
• Material: Malleable Iron
• Finish: Galvanized
• Connection Type: Threaded NPT

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 811092618