Merit Brass SW3687D-02 Pipe Union 1/8 Inch 316 Ss

Product Description

The MERIT BRASS SW3687D-02 is a 1/8 inch socket weld pipe union manufactured from 316 stainless steel. Unions allow a pipeline to be broken at a single point without disturbing adjacent fittings, making them essential for maintenance and component replacement in pressurized systems. This fitting carries a 3,000 psi pressure rating, making it suitable for high-pressure fluid and gas service. The socket weld end connections provide a strong, permanent joint when welded by a qualified fitter. Licensed pipefitters and plumbers install this type of union in industrial, commercial, and marine piping systems.

This union is suited for small-bore piping runs in high-pressure process lines, chemical service, and marine or coastal environments where corrosion resistance is a priority. The 316 stainless steel alloy offers improved chloride resistance compared to 304-grade material, making it a common choice in salt-water-adjacent installations, food processing environments, and chemical distribution systems. The 1/8 inch size fits instrumentation and small-diameter branch lines.

Key Features

• 3,000 psi pressure rating for high-pressure service applications
• 316 stainless steel construction for superior corrosion resistance
• Socket weld x socket weld end connections for permanent, full-penetration weld joints
• 1/8 inch fitting size suited for small-bore and instrumentation piping
• Compact form factor allows disassembly of the line at a single break point

Compatibility

Designed as an OEM-style replacement or new-installation fitting for 1/8 inch socket weld piping systems requiring 316 stainless steel unions rated to 3,000 psi.

Installation Notes

Installation must be performed by a qualified pipefitter or licensed plumber in accordance with applicable codes such as ASME B16.11 and the applicable sections of the International Plumbing Code. Depressurize and isolate the line completely before cutting in or removing any union. Socket weld joints require proper gap spacing per ASME standards before welding and must be performed by a certified welder where code requires. Do not over-tighten the union nut or attempt to use this fitting in threaded-only applications.