Sigma 810081208 Fig 3121 Pipe Coupling 2 in Fnpt 150 Lb

Product Description

The SIGMA 810081208 is a FIG 3121 malleable iron pipe coupling designed for threaded pipe assemblies in plumbing, mechanical, and industrial piping systems. Sized at 2 inches nominal with female NPT (FNPT) threads on both ends, this coupling connects two sections of pipe in a straight run. It carries a 150 lb pressure rating and features a black oxide finish that provides basic corrosion resistance for interior and dry-location applications. Licensed plumbers and pipefitters are the primary installers in both residential and light commercial work.

This coupling is suited for use in low-pressure steam, water, and gas distribution piping where malleable iron fittings are specified. The FNPT end style accepts standard tapered pipe threads, making it compatible with common black iron pipe systems used in natural gas supply lines, fire protection branch lines, and general mechanical piping. The black oxide finish is standard for black iron pipe assemblies in interior applications.

Key Features

• 2 inch nominal size with FNPT threads on both ends for straight-run pipe connections
• 150 lb pressure class rated malleable iron construction
• Black oxide finish standard for black iron pipe systems
• FIG 3121 pattern for consistent thread engagement and sealing
• Compatible with standard NPT-threaded black iron pipe

Compatibility

Designed as an OEM-style replacement or new-installation fitting for 2 inch NPT threaded malleable iron pipe systems rated at 150 lb class.

Installation Notes

Installation is performed by a licensed plumber or pipefitter following applicable IPC or IFGC requirements for the service intended. Shut off and depressurize the pipe system completely before disassembling any threaded connections. Apply an appropriate thread sealant or PTFE tape to the male threads before assembly. Do not exceed the 150 lb pressure class rating of this fitting.

Technical Specifications

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

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 810081208