Sigma 810031211 Fig 3105 Pipe Tee 3 in Fnpt 150 Lb Malleable Iron

Product Description

The SIGMA 810031211 is a FIG 3105 straight pipe tee designed for threaded pipe assemblies in commercial and industrial piping systems. It features a 3-inch nominal size with female national pipe taper (FNPT) end connections on all three ports, allowing direct thread engagement with standard pipe. Built from malleable iron with a black oxide finish, this fitting carries a 150 lb pressure rating and provides reliable flow splitting or combining in black iron pipe runs. Licensed plumbers and pipefitters install this fitting in gas distribution, fire protection, and general utility piping where a durable, code-compliant threaded tee is required.

This tee is suited for residential and light commercial applications including natural gas supply lines, steam and hot water heating systems, compressed air distribution, and industrial process piping. The FNPT thread pattern on all three outlets ensures compatibility with standard NPT-threaded pipe and fittings. Black oxide finish is commonly specified for gas and steam service where a non-galvanized iron fitting is required by code or system design.

Key Features

• 3-inch nominal size fits standard schedule pipe in the same size class
• FNPT end style on all three ports for straightforward threaded assembly
• 150 lb pressure-rated construction for demanding piping service
• Malleable iron body provides impact resistance and ductility versus cast iron
• Black oxide finish suitable for gas, steam, and non-galvanized service requirements

Compatibility

Designed as an OEM-style replacement or new-installation fitting for 3-inch NPT threaded piping systems rated at 150 lb class service.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable codes such as the International Plumbing Code (IPC) or International Fuel Gas Code (IFGC). Shut off and depressurize the pipe system completely before disassembling or installing any threaded fittings. Apply an appropriate thread sealant or PTFE tape to male threads before engagement, and tighten to the fitting manufacturer's recommended thread engagement depth. Do not over-torque malleable iron fittings, as the material can crack under excessive force.

Technical Specifications

• Nominal Size: 3 inches
• End Style: FNPT (Female National Pipe Taper)
• Pressure Rating: 150 lb
• Material: Malleable Iron
• Finish: Black Oxide
• Figure Number: FIG 3105

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 810031211