Sigma 811048008 Malleable Iron Galvanized Reducing Tee Fnpt 150 Lb

Product Description

The SIGMA 811048008 is a FIG 3105R malleable iron galvanized reducing tee designed for threaded pipe systems in commercial and industrial plumbing, gas distribution, and mechanical piping applications. The fitting is rated at 150 lb and features female national pipe taper (FNPT) threads on all three ends. Nominal sizing is 1-1/2 inches on the run with 3/4-inch branch and outlet connections, making it a standard reducing configuration for stepping down flow paths in a main line. Galvanized finish provides corrosion resistance for wet or exposed installations. The malleable iron body delivers the toughness required for screwed piping systems operating under typical working pressures in low-pressure steam, water, oil, gas, and air service.

This fitting is suited for residential and light commercial mechanical systems where a threaded reducing branch connection is required. Typical applications include hydronic heating piping, compressed air distribution, fire protection auxiliary lines, and general plumbing rough-in work. The FNPT thread pattern mates with standard NPT-threaded pipe and fittings in Schedule 40 or Schedule 80 configurations. It is commonly installed by licensed plumbers, pipefitters, and mechanical contractors working on threaded black or galvanized piping systems.

Key Features

• 150 lb pressure rating suitable for steam, water, oil, gas, and air service
• FNPT threads on all three ends for standard NPT pipe compatibility
• 1-1/2 inch run x 3/4 inch x 3/4 inch nominal reducing configuration
• Malleable iron construction for strength and impact resistance in screwed systems
• Galvanized finish for corrosion resistance in wet or exposed environments
• FIG 3105R pattern conforms to standard reducing tee dimensional specifications

Compatibility

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

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable mechanical and plumbing codes, including the IPC and IFGC where relevant. Shut off and depressurize the system completely before removing or installing any threaded fittings. Apply an appropriate thread sealant or PTFE tape to the male NPT threads before assembly. Do not over-torque threaded connections, as malleable iron can crack under excessive force.

Technical Specifications

• Figure Number: 3105R
• Nominal Size: 1-1/2 x 3/4 x 3/4 inches
• End Style: FNPT (Female National Pipe Taper)
• Pressure Rating: 150 lb
• Material: Malleable Iron
• Finish: Galvanized

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 811048008