Sigma 810041012 Malleable Iron Reducing Tee 1x3/4x1/2 Fnpt

Product Description

The SIGMA 810041012 is a malleable iron reducing tee designed for threaded pipe systems operating at up to 150 lb pressure class. It features female national pipe taper (FNPT) threads on all three outlets and a black oxide finish that provides basic corrosion resistance in dry or mildly exposed environments. The nominal size configuration is 1 inch run by 3/4 inch run by 1/2 inch branch, making it a standard reducing fitting for branching off a main line to a smaller service line. Licensed plumbers and pipefitters install this fitting in gas distribution, steam, and water piping systems where a directional branch at a reduced diameter is required.

This reducing tee is suited for residential and light commercial piping installations. It is commonly used where a 1-inch main line must continue while also feeding a 1/2-inch branch line through a 3/4-inch transition. Typical applications include natural gas distribution piping, steam heating systems, and general-purpose black iron pipe assemblies. The FNPT thread pattern is compatible with standard NPT-threaded pipe and fittings throughout these systems.

Key Features

• Malleable iron construction handles thermal cycling and mechanical stress better than cast iron in threaded systems
• Black oxide finish provides mild corrosion protection suitable for interior and sheltered installations
• FNPT threads on all three connections accept standard NPT male-threaded pipe
• 150 lb pressure class rating for use in low-pressure steam, gas, and water service
• Reducing configuration: 1 inch x 3/4 inch x 1/2 inch nominal for branching to smaller diameter lines

Compatibility

Designed as an OEM-style replacement or new-installation fitting for standard NPT black iron pipe systems in residential and light commercial plumbing, gas, and steam applications.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local plumbing and fuel gas codes, including IPC and IFGC requirements where adopted. Shut off and depressurize the line fully before removing any existing fittings or threading in the new tee. Apply an appropriate thread sealant or PTFE tape rated for the service medium to all male threads before assembly. Do not over-tighten threaded connections in malleable iron fittings, as this can crack the fitting body.

Technical Specifications

• Nominal Size: 1 x 3/4 x 1/2 inches
• End Style: FNPT (Female National Pipe Taper)
• Pressure Class: 150 lb
• Material: Malleable Iron
• Finish: Black Oxide
• Fitting Type: Reducing Tee

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 810041012