Sigma 810042606 Malleable Iron Reducing Tee 1-1/4x1-1/4x3/4 150lb

Product Description

The SIGMA 810042606 is a FIG 1105R malleable iron reducing tee rated for 150 lb service. It features female NPT (FNPT) threads on all three ports and carries a black oxide finish for corrosion resistance in typical black iron pipe installations. The run measures 1-1/4 inches on both ends, with a 3/4-inch branch outlet, making it the standard choice when stepping down a branch line from a larger main. Plumbers and pipefitters install this fitting in threaded black iron piping systems for gas distribution, steam, compressed air, and general industrial service.

This reducing tee is suited for residential and light commercial applications where a 1-1/4-inch threaded main line requires a reduced 3/4-inch branch takeoff. Typical install scenarios include natural gas supply lines, low-pressure steam systems, and compressed air distribution headers. The black oxide finish is standard for gas piping and matches conventional black iron pipe and fittings used throughout these systems.

Key Features

• 150 lb pressure class rating for low-pressure gas, steam, and air service
• FNPT threads on all three ports for standard threaded pipe assembly
• 1-1/4 inch run by 3/4 inch branch configuration reduces branch line size at the tee
• Malleable iron construction provides impact resistance and thread integrity superior to cast iron
• Black oxide finish is compatible with gas piping conventions and resists surface oxidation
• FIG 1105R geometry conforms to ASME B16.3 dimensional standards for malleable iron threaded fittings

Compatibility

Designed as an OEM-style threaded fitting for use with standard 1-1/4-inch and 3/4-inch NPT black iron pipe in 150 lb threaded piping systems.

Installation Notes

Installation is performed by licensed plumbers or pipefitters following applicable code requirements such as the IFGC or IPC for gas and plumbing systems. Shut off and depressurize the line completely before disassembling or installing any threaded fitting. Apply an approved thread sealant or PTFE tape rated for the service medium before making up threads. Do not over-tighten; use a pipe wrench with a backup wrench on adjacent fittings to avoid stressing connected pipe.

Technical Specifications

• Figure Number: 1105R
• Nominal Size: 1-1/4 x 1-1/4 x 3/4 inches
• End Style: FNPT (Female National Pipe Thread)
• Pressure Rating: 150 lb
• Material: Malleable Iron
• Finish: Black Oxide

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 810042606