Sigma 813508009 Ground Joint Pipe Union 1/2 in Fnpt 150 Lb

Product Description

The SIGMA 813508009 is a ground joint pipe union rated for 150 lb service in galvanized malleable iron. It connects two sections of threaded pipe with a female NPT (FNPT) end style on both sides and uses a ground joint seat to create a leak-resistant metal-to-metal seal. The three-piece union design allows the pipe assembly to be broken apart and reconnected without disturbing the surrounding piping. It is installed by licensed plumbers and pipefitters on gas, water, and general-service piping systems where routine disconnection of a pipe run is required.

This union is suited for residential and light commercial plumbing and gas piping applications. The galvanized finish provides corrosion resistance in exposed or semi-exposed installations such as mechanical rooms, utility spaces, and above-grade pipe runs. The 1/2 inch nominal size fits standard Schedule 40 threaded pipe and is a common fitting in low-pressure domestic water and gas distribution systems.

Key Features

• Ground joint seat provides a metal-to-metal seal without requiring a gasket
• 150 lb pressure rating suitable for standard plumbing and gas service
• Galvanized malleable iron construction resists corrosion in damp environments
• FNPT threads on both ends accept standard NPT-threaded pipe
• Three-piece design allows the pipe run to be disconnected and reconnected at the union

Compatibility

Designed as an OEM-style replacement or new-installation fitting for 1/2 inch nominal NPT threaded pipe systems in residential and commercial plumbing and gas piping applications.

Installation Notes

Installation is performed by a licensed plumber or pipefitter following applicable IPC or IFGC requirements. Shut off and depressurize the pipe system completely before removing or installing any union. Apply thread sealant or pipe tape appropriate for the service medium to all male NPT threads before assembly. Do not over-tighten the union nut, as malleable iron threads can be damaged by excessive force.

Technical Specifications

• Nominal Size: 1/2 inch
• End Style: FNPT (Female NPT)
• Pressure Rating: 150 lb
• Material: Malleable Iron
• Finish: Galvanized
• Figure Number: FIG 3463

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 813508009