Merit Brass 3412D-0402 Pipe Reducer 1/4 X 1/8 in Fnpt Ss

Product Description

The MERIT BRASS 3412D-0402 is a threaded pipe reducer fitting designed to transition from a 1/4-inch to a 1/8-inch female NPT connection in pressurized piping systems. Constructed from 304/304L stainless steel, this reducer delivers corrosion resistance suitable for demanding industrial, commercial, and mechanical service environments. Rated to 3,000 psi, it handles high-pressure applications where material integrity and thread engagement are critical. Both end connections are FNPT, making installation straightforward with standard NPT fittings and thread sealant. Licensed plumbers, pipefitters, and mechanical contractors typically install fittings of this type in gas, fluid, and pneumatic lines.

This reducer is appropriate for use in residential and commercial plumbing, HVAC piping, compressed air systems, and similar fluid-handling applications where a reduction from 1/4-inch to 1/8-inch NPT is required. The 304/304L stainless steel construction makes it well suited for systems exposed to moisture, mild chemicals, or corrosive environments. It is sold individually and is a direct-thread fitting requiring no special tooling beyond a pipe wrench or strap wrench and compatible NPT thread sealant or tape.

Key Features

• 304/304L stainless steel construction for corrosion resistance in wet and chemical-exposed environments
• 3,000 psi pressure rating suitable for high-pressure fluid and pneumatic service
• FNPT x FNPT threaded connections compatible with standard NPT pipe and fittings
• Reduces from 1/4-inch to 1/8-inch female NPT in a compact form factor
• Sold as a single piece with no minimum multi-unit purchase required

Compatibility

Designed as an OEM-style threaded reducer for use with standard 1/4-inch and 1/8-inch NPT piping systems in plumbing, HVAC, compressed air, and industrial fluid-handling applications.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable IPC or IFGC code requirements. Depressurize and isolate the system completely before removing any existing fittings or threading in this reducer. Apply appropriate thread sealant or PTFE tape to all male NPT threads before making up connections. Do not overtighten, as stainless steel threads can gall if excessive torque is applied.