Sigma 811030618 Straight Pipe Tee 1-1/2 in Fnpt 150 Lb

Product Description

The SIGMA 811030618 is a straight pipe tee fitting designed for threaded piping assemblies in plumbing, HVAC, and mechanical systems. Built to FIG 3105 standards, this tee features a 1-1/2 inch nominal size with female national pipe taper (FNPT) end connections on all three ports. Constructed from malleable iron with a galvanized finish, it carries a 150 lb pressure rating. The galvanized coating provides corrosion resistance for installations in wet or exposed environments. Licensed plumbers and pipefitters install this fitting in both new construction and retrofit applications.

This tee is suited for residential and light commercial piping systems where a branch connection is required along a straight run of threaded pipe. Common applications include water supply lines, gas distribution piping, compressed air systems, and steam lines operating within the 150 lb pressure class. The FNPT threading on all three outlets ensures compatibility with standard NPT male-threaded pipe and fittings.

Key Features

• 1-1/2 inch nominal size with FNPT connections on all three ports
• 150 lb pressure-rated malleable iron construction
• Galvanized finish for corrosion resistance in wet or exposed environments
• FIG 3105 straight tee configuration for in-line branch connections
• Standard NPT threading for wide compatibility with threaded pipe systems

Compatibility

Designed as an OEM-style replacement and standard fitting for 1-1/2 inch nominal threaded pipe systems using 150 lb class malleable iron fittings with NPT connections.

Installation Notes

Installation is performed by licensed plumbers or pipefitters following applicable IPC and IFGC guidelines. Shut off and depressurize the line before disassembly or installation. Apply an appropriate thread sealant or PTFE tape to all male NPT threads before assembly and tighten to a snug, leak-free fit using pipe wrenches. Do not over-torque malleable iron fittings, as the material can crack under excessive force.

Technical Specifications

• Nominal Size: 1-1/2 inches
• End Style: FNPT (Female National Pipe Taper)
• Pressure Rating: 150 lb
• Material: Malleable Iron
• Finish: Galvanized
• Figure Number: FIG 3105
• Configuration: Straight Tee

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 811030618