Sigma 810089607 Reducing Coupling 2x3/4 in Fnpt 150 Lb

Product Description

The SIGMA 810089607 is a FIG 3121R malleable iron reducing coupling designed to connect pipes of two different nominal sizes in threaded piping systems. Rated at 150 lb, this fitting features female National Pipe Taper (FNPT) threads on both ends and accommodates a 2-inch nominal inlet reducing to a 3/4-inch nominal outlet. The black oxide finish provides a degree of corrosion resistance suitable for standard indoor and dry service applications. Plumbers and pipefitters install this type of fitting in low-pressure water, steam, and general-purpose piping assemblies where a diameter reduction is required at a threaded joint.

This reducing coupling is suited for residential and light commercial plumbing, fire protection, and industrial piping applications where malleable iron Class 150 threaded fittings are specified. It is appropriate for use in steam, water, oil, and air service within the pressure and temperature limits of a 150 lb malleable iron fitting. The FNPT thread form on both ends accepts standard NPT-threaded pipe, making it compatible with the broad range of pipe and fittings found in typical trade installations.

Key Features

• Malleable iron construction provides durability and resistance to impact in threaded piping systems
• FNPT threads on both ends accept standard NPT pipe for straightforward installation
• 150 lb pressure class rating suitable for low-pressure steam, water, oil, and air service
• Black oxide finish for basic surface protection in dry or indoor environments
• Reduces from 2-inch nominal to 3/4-inch nominal in a single fitting

Compatibility

Designed as an OEM-style replacement or new-installation fitting for Class 150 malleable iron threaded piping systems using standard NPT pipe connections.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable plumbing codes, including the IPC and IFGC where relevant. Shut off and depressurize the piping system fully before removing or installing any threaded fittings. Apply an approved pipe thread sealant or PTFE tape to male threads before assembly, and tighten to appropriate engagement without over-torquing malleable iron threads. Do not exceed the pressure and temperature ratings of the 150 lb fitting class for the intended service fluid.

Technical Specifications

• Material: Malleable Iron
• Finish: Black Oxide
• Thread Style: FNPT both ends
• Inlet Size: 2 inches nominal
• Outlet Size: 3/4 inch nominal
• Pressure Class: 150 lb
• Figure Number: FIG 3121R

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 810089607