Usa Industrials ZUSA-PF-4990 Brass Reducing Adapter

Product Description

The USA INDUSTRIALS ZUSA-PF-4990 is a straight brass pipe reducing adapter designed to connect a 1/4-inch female NPT port to a 1/8-inch male NPT fitting in a single inline step-down. Rated to 2,800 psi, this adapter handles demanding instrumentation and process piping applications where a reliable threaded reduction is required. The all-brass construction resists corrosion and provides the dimensional stability needed in both gas and liquid service lines. Plumbers, pipefitters, and instrumentation technicians routinely specify this type of adapter when transitioning between pipe sizes without adding unnecessary fittings to the assembly.

This reducing adapter is suited for use in instrumentation systems, compressed air lines, hydraulic circuits, and general industrial plumbing where a 1/4-inch to 1/8-inch NPT thread reduction is needed. Its straight fitting shape makes it appropriate for tight spaces and inline routing. The FNPT x MNPT end configuration allows it to thread directly into a female-ported valve, manifold, or instrument body while accepting a male-threaded pipe or hose assembly on the outlet side.

Key Features

• 2,800 psi pressure rating suitable for instrumentation and process piping service
• FNPT x MNPT threaded ends for direct inline pipe size reduction
• Straight fitting shape for compact, inline installations
• Brass construction provides corrosion resistance in air, water, and compatible fluid service
• Meets ANSI/ASME B1.20.1, ANSI/ASME B31.1, and ANSI/ASME B31.3 standards

Compatibility

Designed as a standard ANSI/ASME B1.20.1-compliant NPT threaded reducing adapter for use in instrumentation-class piping systems requiring a 1/4-inch FNPT to 1/8-inch MNPT connection.

Installation Notes

Installation should be performed by a licensed plumber or qualified pipefitter in accordance with applicable piping codes including ANSI/ASME B31.1 and B31.3. Depressurize and isolate the line completely before removing or installing any threaded fitting. Apply thread sealant or PTFE tape to the male threads per the system fluid compatibility requirements. Do not overtighten brass fittings, as this can crack the fitting body or damage mating threads.