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.

WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.