Merit Brass 3612D-1206 Pipe Reducer 3/4x3/8 Fnpt 3000 Psi

Product Description

The MERIT BRASS 3612D-1206 is a threaded pipe reducer fitting machined from 316/316L stainless steel for demanding fluid and gas piping systems. It reduces a 3/4 inch female NPT (FNPT) inlet down to a 3/8 inch FNPT outlet and carries a 3,000 psi pressure rating. The dual-grade 316/316L designation means it meets both standard and low-carbon corrosion resistance requirements, making it suitable for chemical process, marine, food service, and instrumentation applications. Licensed plumbers, pipefitters, and industrial maintenance technicians install this fitting in threaded piping assemblies where a secure, leak-resistant diameter transition is required.

This reducer is suited for residential and commercial piping systems that require a step-down transition between 3/4 inch and 3/8 inch threaded lines. Typical applications include process piping, hydraulic lines, instrumentation tubing, and fluid handling systems where stainless steel is specified for corrosion resistance or sanitary compliance. The FNPT x FNPT configuration accepts standard NPT male threaded pipe on both ends, fitting into any compliant threaded assembly without adapters.

Key Features

• 316/316L stainless steel construction for superior corrosion resistance in wet, chemical, and marine environments
• 3,000 psi pressure rating supports high-pressure piping and instrumentation service
• 3/4 inch x 3/8 inch reduction in a single fitting eliminates the need for multiple adapters
• FNPT x FNPT end connections for standard NPT threaded pipe compatibility
• Low-carbon 316L grade reduces risk of intergranular corrosion after welding or high-heat exposure

Compatibility

Designed as an OEM-style threaded pipe reducer for use in any 3/4 inch to 3/8 inch NPT threaded piping system requiring 316 or 316L stainless steel fittings rated to 3,000 psi.

Installation Notes

Installation is performed by licensed plumbers or qualified pipefitters following applicable IPC and ASME B1.20.1 thread standards. Shut down system pressure and depressurize the line fully before removing or installing any threaded fitting. Apply an appropriate thread sealant or PTFE tape to the male NPT threads before assembly to ensure a leak-free joint. Do not over-torque stainless steel fittings, as galling of the threads can occur.