Merit Brass K417A-02 Square Head Pipe Plug 1/8 in 304 Ss

Product Description

The MERIT BRASS K417A-02 is a square head pipe plug designed to seal threaded pipe ends in plumbing, HVAC, and industrial piping systems. Machined from 304 stainless steel, this plug connects via a male NPT thread and is rated to 150 psi. The square head drive allows installation and removal with a wrench or socket, making it a practical choice in tight spaces where a slotted or hex style may be awkward to drive. Plumbers, pipefitters, and HVAC technicians use this style of plug to cap off unused branch openings or service ports during system assembly and maintenance.

This plug is suited for residential and light commercial piping applications where corrosion resistance and reliable thread engagement matter. Common uses include capping low-pressure gas, water, and compressed air lines. The ISO-conforming thread form ensures compatibility with standard NPT fittings throughout a system. At 1/8 inch fitting size, it is typically used on instrument ports, gauge taps, and small branch connections.

Key Features

• 304 stainless steel construction resists corrosion in wet and mildly corrosive environments
• 150 psi pressure rating suitable for low-pressure piping systems
• Male NPT threaded connection for standard pipe fitting engagement
• Square head drive accepts a wrench or socket for secure installation and removal
• ISO-conforming thread standards for consistent fit with NPT system components
• Compact 1/8 inch size fits instrument taps, gauge ports, and small branch outlets

Compatibility

Designed as an OEM-style replacement or service plug for standard 1/8 inch male NPT threaded pipe fittings in residential and commercial piping systems.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable IPC or IFGC guidelines for the fluid or gas being conveyed. Shut off and depressurize the line completely before removing or installing any threaded plug. Apply an appropriate thread sealant or PTFE tape to the male threads before installation. Do not overtighten, as stainless steel threads can gall if excessive torque is applied.