Sigma 811089408 Galvanized Reducing Coupling 2x1 in Fnpt 150lb

Product Description

The SIGMA 811089408 is a FIG 3121R malleable iron reducing coupling designed to connect pipe runs of two different diameters in threaded piping systems. Sized at 2 x 1 inches nominal with female national pipe thread (FNPT) ends on both sides, this fitting steps down the line without requiring additional adapters. Rated at 150 lb, it is built for standard-pressure threaded systems. The hot-dip galvanized finish provides corrosion resistance suitable for indoor and outdoor environments where moisture exposure is a concern. Licensed plumbers and pipefitters are the primary installers for this type of fitting.

This reducing coupling is used in commercial and industrial piping systems where a pipe size reduction is needed along a threaded run. Typical applications include water distribution lines, low-pressure steam systems, compressed air distribution, and general mechanical piping. The FNPT thread pattern on both ends accepts standard NPT-threaded pipe, making it compatible with common black or galvanized pipe stock available through wholesale supply channels. It is well-suited for maintenance, repair, and new-construction work across light commercial and industrial settings.

Key Features

• Reduces from 2 inch nominal to 1 inch nominal in a single fitting
• FNPT end style on both sides for connection to standard NPT-threaded pipe
• 150 lb pressure rating for standard threaded piping service
• Malleable iron construction provides impact resistance and thread integrity
• Galvanized finish for corrosion protection in wet or outdoor environments

Compatibility

Designed as an OEM-style replacement and standard-use fitting for 150 lb malleable iron threaded piping systems using NPT-threaded pipe.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter following applicable IPC and IFGC code requirements for the system type. Shut off and depressurize the piping system completely before removing or installing any threaded fittings. Apply an appropriate thread sealant or PTFE tape to the male threads before making up the joint. Do not over-tighten, as malleable iron threads can crack under excessive torque.

Technical Specifications

• Nominal Size: 2 x 1 inches
• End Style: FNPT (Female National Pipe Thread) both ends
• Pressure Rating: 150 lb
• Material: Malleable Iron
• Finish: Galvanized
• Figure Number: FIG 3121R

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 811089408