Merit Brass 3412D-2012 Pipe Reducer 1-1/4x3/4 Fnpt 3000psi

Product Description

The MERIT BRASS 3412D-2012 is a threaded stainless steel pipe reducer designed to transition between a 1-1/4 inch female NPT inlet and a 3/4 inch female NPT outlet in pressurized piping systems. Constructed from 304/304L stainless steel, this fitting delivers strong corrosion resistance and structural integrity across a wide range of fluid handling applications. Rated to 3,000 psi, it is suited for demanding service conditions in industrial, commercial plumbing, and process piping installations. Both end connections are FNPT, allowing straightforward threaded assembly without welding or specialty tooling. Plumbers, pipefitters, and mechanical contractors typically specify this fitting for in-line diameter reductions in water, gas, and chemical service lines.

This reducer sees common use in residential and commercial mechanical rooms, industrial process piping, and utility systems where line size must be stepped down from 1-1/4 inch to 3/4 inch. The 304/304L dual-grade material designation makes it appropriate for both standard and low-carbon stainless steel specifications, broadening its compatibility with existing piping systems and engineering requirements. The threaded FNPT x FNPT configuration suits retrofit and replacement work where welding is not practical or permitted.

Key Features

• 304/304L stainless steel construction provides corrosion resistance for water, gas, and chemical service
• 3,000 psi pressure rating handles high-pressure industrial and commercial piping applications
• FNPT x FNPT threaded ends allow tool-only installation with no welding required
• 1-1/4 inch to 3/4 inch reduction covers one of the most common in-line diameter step-downs
• Dual-grade 304/304L material meets both standard and low-carbon stainless specifications

Compatibility

Designed as an OEM-style threaded reducer fitting for use in standard NPT piping systems requiring a 1-1/4 inch to 3/4 inch female-to-female diameter reduction in stainless steel service.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local mechanical and plumbing codes. Depressurize and drain the line completely before removing or installing any threaded fitting. Apply an appropriate thread sealant or PTFE tape rated for the service medium to all NPT threads before assembly. Do not overtighten threaded connections, as stainless steel threads are susceptible to galling.