Merit Brass C103A-04 Brass Pipe Fitting 1/4 in Fnpt Mnpt

Product Description

The MERIT BRASS C103A-04 is a brass pipe fitting designed for low-pressure fluid and gas piping systems. It features a 1/4-inch female NPT inlet and a male NPT outlet, making it a standard union-style adapter used to extend or transition threaded pipe runs. Rated at Class 125, it is suited for general-purpose plumbing, HVAC hydronic lines, compressed air, and light industrial piping. Licensed plumbers and pipefitters install this fitting as part of threaded pipe assemblies where a female-to-male NPT connection is required. The brass construction provides solid corrosion resistance across a range of service fluids.

This fitting is used in residential and light commercial applications where 1/4-inch NPT threaded connections are standard. Typical install scenarios include branch connections on water supply lines, instrument takeoffs, and HVAC control line piping. The FNPT x MNPT configuration allows it to serve as a close nipple adapter or a thread-direction transition point within an existing threaded assembly.

Key Features

• 1/4-inch fitting size with FNPT x MNPT end connections for direct threaded pipe assembly
• Class 125 pressure rating suitable for general-purpose plumbing and HVAC piping
• Brass construction for corrosion resistance in water, air, and compatible fluid service
• Compact, lightweight design at 0.15 pounds for easy handling in tight spaces
• Standard NPT threading for compatibility with common threaded pipe and fittings stock

Compatibility

Designed as an OEM-style replacement or new-installation fitting for 1/4-inch NPT threaded pipe systems in residential and light commercial plumbing and HVAC applications.

Installation Notes

Installation should be performed by a licensed plumber or qualified pipefitter in accordance with applicable IPC and local plumbing codes. Shut off and depressurize the water or fluid supply before working on any threaded connection. Apply a compatible thread sealant or PTFE tape to the male threads before assembly to ensure a leak-free joint. Do not overtighten threaded brass fittings, as this can crack the fitting body.