Sigma 813508819 Ground Joint Pipe Union 1-1/4 in Fnpt 150 Lb

Product Description

The SIGMA 813508819 is a FIG 3463 ground joint pipe union rated at 150 lb, designed to create a pressure-tight, removable connection between two sections of threaded pipe. The union features female national pipe taper (FNPT) end connections on both sides and a ground joint seat that provides a metal-to-metal seal when tightened. Constructed from galvanized malleable iron, the fitting resists corrosion in wet and industrial environments. With a nominal pipe size of 1-1/4 inches, this fitting is installed by licensed plumbers and pipefitters in gas, water, steam, and general industrial piping systems where future disconnection is required.

This ground joint union is suited for residential and light commercial piping applications where a serviceable threaded connection is needed. Common install scenarios include gas supply lines, compressed air systems, hydronic heating piping, and water distribution lines. The 150 lb pressure rating makes it appropriate for low-to-moderate pressure service in standard building piping systems. The galvanized finish provides added protection in exposed or mildly corrosive environments.

Key Features

• FIG 3463 ground joint design provides metal-to-metal seal without a gasket
• FNPT end connections on both sides for standard threaded pipe installation
• 150 lb pressure-rated malleable iron construction for reliable service life
• Galvanized finish adds corrosion resistance for wet or exposed installations
• 1-1/4 inch nominal size fits standard Schedule 40 threaded pipe

Compatibility

Designed as an OEM-style replacement and standard-duty fitting for 1-1/4 inch nominal FNPT threaded pipe systems rated at 150 lb service class.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local plumbing and mechanical codes, including IPC and IFGC requirements where applicable. Shut off and depressurize the piping system completely before disassembling or installing any union fitting. Apply an approved pipe thread sealant or PTFE tape to all male threads before assembly. Do not over-tighten the union nut, as malleable iron fittings can crack under excessive torque.

Technical Specifications

• Nominal Pipe Size: 1-1/4 inches
• End Style: FNPT (Female National Pipe Taper)
• Pressure Rating: 150 lb
• Material: Malleable Iron
• Finish: Galvanized
• Figure Number: FIG 3463
• Joint Type: Ground Joint

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 813508819