Sigma 813508207 Ground Joint Pipe Union 3/4 in Fnpt 150 Lb

Product Description

The SIGMA 813508207 is a ground joint pipe union designed for threaded pipe assemblies in plumbing, mechanical, and industrial piping systems. Manufactured from malleable iron with a galvanized finish, this union provides a leak-resistant metal-to-metal seat connection that allows sections of pipe to be joined or disconnected without disturbing the rest of the run. Rated at 150 lb, it accepts 3/4-inch nominal female NPT (FNPT) connections on both ends. Licensed plumbers and pipefitters rely on this type of fitting for gas, water, and steam service in both new construction and retrofit work.

This union is suited for residential and light commercial piping applications where a serviceable, reusable connection point is required. Typical installations include gas supply lines, hydronic heating systems, boiler connections, and general plumbing distribution where periodic access for maintenance or equipment replacement is anticipated. The galvanized coating helps resist corrosion in exposed or moderately humid environments.

Key Features

• Ground joint metal-to-metal seat for reliable, leak-resistant seals
• 3/4-inch nominal size with FNPT end connections on both sides
• 150 lb pressure rating suitable for standard service applications
• Malleable iron construction provides strength and impact resistance
• Galvanized finish for corrosion protection in exposed installations
• Allows pipe runs to be broken and reconnected without cutting or threading

Compatibility

Designed as an OEM-style replacement or standard installation fitting for 3/4-inch nominal threaded pipe systems rated at 150 lb service class.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter following applicable IPC or IFGC code requirements for the intended service. Shut off the supply line and depressurize the system before disassembling or installing any union fitting. Apply thread sealant or PTFE tape appropriate for the service type to all male NPT threads before assembly. Do not over-tighten the union nut, as excessive force can damage the ground joint seat and compromise the seal.

Technical Specifications

• Nominal Size: 3/4 inches
• End Style: FNPT (Female National Pipe Thread)
• Pressure Rating: 150 lb
• Material: Malleable Iron
• Finish: Galvanized
• Figure Number: FIG 3463

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 813508207