Sigma 810039818 Reducing Pipe Tee 1x1x3/4 in Fnpt Malleable Iron

Product Description

The SIGMA 810039818 is a standard reducing pipe tee designed for threaded black iron pipe systems. It features a 1 x 1 x 3/4 inch nominal configuration, meaning the run is 1 inch in diameter and the branch outlet reduces to 3/4 inch. All three ports use female national pipe taper (FNPT) threads for secure, leak-resistant connections. Rated at 150 lb, this fitting is built from malleable iron, which provides the ductility needed to absorb vibration and mechanical stress in live piping systems. The black finish is standard for non-potable applications. Plumbers and pipefitters install this fitting where a branch line steps down in diameter from the main run.

This reducing tee is suited for low-pressure gas distribution, compressed air, and general industrial piping systems where a directional branch takeoff is required at a reduced pipe size. It is a common component in commercial and light industrial installations where 150 lb class malleable iron fittings meet system pressure and temperature requirements. The FNPT thread pattern is compatible with standard NPT-threaded pipe and fittings throughout a system.

Key Features

• 1 x 1 x 3/4 inch nominal reducing configuration with 3/4 inch branch outlet
• FNPT threads on all three ports for standard NPT pipe compatibility
• 150 lb pressure class malleable iron construction
• Black finish suited for gas and non-potable piping applications
• Malleable iron body resists cracking under vibration and mechanical load

Compatibility

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

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local codes, the International Fuel Gas Code (IFGC), or the International Plumbing Code (IPC) depending on service type. Shut off and depressurize the line completely before disassembling any portion of the system. Apply an appropriate thread sealant or PTFE tape rated for the service medium before making up all FNPT connections. Do not overtighten threaded fittings, as malleable iron threads can be damaged by excessive force.

Technical Specifications

• Nominal Size: 1 x 1 x 3/4 inches
• End Style: FNPT (Female National Pipe Taper)
• Pressure Rating: 150 lb
• Material: Malleable Iron
• Finish: Black

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 810039818