Merit Brass K612-0602 Pipe Reducer 3/8x1/8 316 Ss Fnpt

Product Description

The MERIT BRASS K612-0602 is a threaded pipe reducer fitting designed to connect two female NPT ports of different sizes within a pressurized piping system. Machined from 316 stainless steel, it reduces from a 3/8-inch to a 1/8-inch FNPT connection and carries a pressure rating of 150 psi. At 1-7/64 inches in length and weighing 0.11 pounds, this compact fitting is well-suited for tight plumbing or instrumentation assemblies. Plumbers, pipefitters, and mechanical contractors working with stainless steel pipe systems will find this fitting appropriate for both new construction and retrofit applications.

This reducer fitting is used in residential and commercial piping systems where a line-size reduction is required between two female-threaded ports. Typical applications include instrumentation tubing, chemical feed lines, compressed air systems, and process piping where corrosion resistance is a priority. The 316 stainless steel construction makes it a strong choice for environments exposed to moisture, mild chemicals, or marine-adjacent conditions.

Key Features

• Reduces from 3/8-inch FNPT to 1/8-inch FNPT for in-line size transitions
• 316 stainless steel construction offers superior corrosion resistance compared to 304 grade
• 150 psi pressure rating suitable for low- to medium-pressure service
• Threaded FNPT x FNPT end connections for straightforward installation with standard pipe wrenches
• Meets ISO standards for dimensional consistency
• Compact at 1-7/64 inches in length, fits confined spaces

Compatibility

Designed as an OEM-style threaded reducer for use in standard 3/8-inch and 1/8-inch female NPT piping systems where 316 stainless steel and 150 psi-rated fittings are specified.

Installation Notes

Installation is performed by licensed plumbers or qualified pipefitters following applicable IPC and IFGC guidelines. Depressurize and drain the system completely before removing or installing any threaded fitting. Apply an appropriate thread sealant or PTFE tape to all male-threaded mating parts before assembly. Hand-tighten first, then wrench-tighten to a snug fit — do not overtighten stainless steel threads, as galling can occur.