Merit Brass K417A-06 Square Head Pipe Plug 3/8 in 316 Ss

Product Description

The MERIT BRASS K417A-06 is a square head pipe plug designed to seal threaded pipe ends in plumbing, hydraulic, and industrial piping systems. Machined from 316 stainless steel, this plug offers strong corrosion resistance, making it a reliable choice for applications involving moisture, chemicals, or outdoor exposure. The male NPT (MNPT) threaded connection meets ISO standards and is rated to 150 psi. At 3/8 inch fitting size, it suits a wide range of small-bore pipe assemblies. Plumbers, pipefitters, and industrial maintenance technicians routinely install this style of plug to cap off unused ports, test points, or branch outlets.

This plug is used in residential and commercial plumbing systems, process piping, and mechanical equipment where a durable, corrosion-resistant pipe closure is needed. The square head drive allows installation and removal with a standard wrench or socket, which is practical in tight spaces or where a flush-style plug is not required. Its 316 stainless steel construction suits environments where 304 stainless may not provide adequate corrosion resistance, such as coastal, marine, or chemical-adjacent installations.

Key Features

• 316 stainless steel construction for superior corrosion resistance over standard 304 SS
• 3/8 inch MNPT threaded connection for secure, leak-resistant sealing
• 150 psi pressure rating suitable for low- to medium-pressure piping systems
• Square head drive accepts standard wrench or socket for easy installation and removal
• Meets ISO standards for threaded pipe fittings

Compatibility

Designed as an OEM-style replacement or service fitting for 3/8 inch female NPT threaded ports in standard pipe assemblies rated to 150 psi.

Installation Notes

Installation is performed by licensed plumbers or qualified pipefitters following applicable IPC or ASME B31 piping code requirements. Shut off and depressurize the system completely before removing or installing any threaded pipe fitting. Apply a compatible thread sealant or PTFE tape to the male threads before installation. Do not over-tighten stainless steel threaded fittings, as galling can occur; use controlled hand-plus-wrench engagement.