Merit Brass 3417HD-06 Hex Pipe Plug 3/8 in 304 Ss Mnpt

Product Description

The MERIT BRASS 3417HD-06 is a heavy-duty hex pipe plug designed for threaded pipe systems requiring a secure, leak-resistant closure. Machined from 304/304L stainless steel, this male NPT plug offers a pressure rating of 3,000 psi, making it well suited for demanding fluid handling, compressed air, and process piping applications. The hex head allows for standard wrench installation, and the MNPT thread form provides reliable sealing when used with appropriate thread sealant. Licensed plumbers, pipefitters, and industrial maintenance technicians are the typical installers for this fitting.

This plug is used to close off open female NPT ports in residential and commercial piping systems, hydraulic manifolds, pneumatic assemblies, and industrial process lines. The 3/8 inch fitting size covers a common port size found across a wide range of valves, pumps, and pipe fittings. The 304/304L dual-grade stainless steel construction provides corrosion resistance suitable for water, steam, mild chemicals, and food-adjacent service environments where carbon steel is not appropriate.

Key Features

• Pressure rated to 3,000 psi for high-demand piping applications
• 304/304L stainless steel construction for corrosion resistance in wet and chemical environments
• MNPT threaded end connection for compatibility with standard female NPT ports
• Hex head design accepts standard wrenches for torque-controlled installation
• 3/8 inch fitting size covers a widely used port dimension across valves, pumps, and manifolds

Compatibility

Designed as an OEM-style replacement or new-installation hex pipe plug for standard female NPT threaded ports in commercial and industrial piping systems.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable IPC and ASME B31 piping codes. Depressurize and drain the line fully before removing or installing any threaded pipe plug. Apply an appropriate thread sealant or PTFE tape to the male threads before tightening. Do not overtighten, as this can crack fittings or damage female port threads.