Merit Brass 3487D-02 Pipe Union 1/8 in 304 Ss Fnpt 3000 Psi

Product Description

The MERIT BRASS 3487D-02 is a 1/8 inch stainless steel pipe union designed for threaded piping systems where disassembly and reassembly are required without disturbing the surrounding pipe run. Constructed from 304 and 304L stainless steel, this union offers solid corrosion resistance across a wide range of fluids and environments. It carries a 3,000 psi pressure rating, making it appropriate for moderate- to high-pressure service lines. Both end connections are FNPT, joining two female-threaded pipe ends through the union body. Licensed plumbers and pipefitters are the typical installers in commercial, industrial, and mechanical system applications.

This union is suited for use in tight-diameter instrument lines, pneumatic controls, and low-flow process piping where 1/8 inch NPT connections are standard. The 304 and 304L dual-grade material designation makes it compatible with mildly corrosive media and sanitary-adjacent environments. It is commonly specified in mechanical rooms, process panels, and equipment skids where stainless fittings are required by design or code. The compact size suits gauge connections, bleed ports, and pilot lines in both residential and light commercial mechanical systems.

Key Features

• 304 and 304L stainless steel construction for corrosion resistance in demanding service environments
• 3,000 psi pressure rating suitable for moderate- to high-pressure threaded systems
• FNPT x FNPT end connections for straight in-line installation between two threaded pipe ends
• Threaded union design allows full disassembly of a pipe run without cutting or unthreading adjacent fittings
• 1/8 inch fitting size for instrument lines, pilot lines, and gauge ports

Compatibility

Designed as an OEM-style replacement or new-installation fitting for 1/8 inch FNPT threaded stainless steel piping systems operating within the 3,000 psi pressure rating of this union.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable piping codes such as the IPC or ASME B31 standards. Shut off and depressurize the system fully before removing or installing any union fitting. Apply thread sealant or PTFE tape to male threads per the system fluid and code requirements. Do not over-tighten stainless NPT fittings, as galling of the threads can occur with stainless-to-stainless connections.