Merit Brass NLBS117A-02 Brass Square Head Plug 1/8 in

Product Description

The MERIT BRASS NLBS117A-02 is a lead-free brass square head pipe plug designed to seal open pipe ends and unused fittings in pressurized piping systems. Sized at 1/8 inch with male NPT external threads, this plug threads into a female NPT port to provide a reliable, pressure-rated closure. It carries a Class 125 pressure rating of 125 psi, making it suitable for low-to-medium pressure plumbing, gas, and fluid distribution applications. The solid brass construction resists corrosion and meets lead-free requirements for potable water compliance. Plumbers and pipefitters install this fitting as a standard part of system assembly and pressure testing.

This plug is used in residential and light commercial plumbing, HVAC hydronic systems, compressed air distribution, and general fluid handling wherever a 1/8 inch female NPT port needs to be capped or blanked off. It is commonly installed during pressure testing to temporarily or permanently seal unused tee branches, valve bodies, or manifold ports. Its small profile and square head drive make it practical for installations in tight spaces using a standard wrench or socket.

Key Features

• Lead-free brass construction meets potable water and plumbing code requirements
• 1/8 inch MNPT x FNPT threaded connection for direct NPT port engagement
• Class 125 rated to 125 psi for low-to-medium pressure service
• Square head drive allows installation and removal with a wrench or socket
• Compact form factor fits tight quarters common in manifold and valve assemblies

Compatibility

Designed as an OEM-style replacement or new-installation fitting for any 1/8 inch female NPT port in plumbing, HVAC, or fluid distribution piping rated at Class 125 or below.

Installation Notes

This fitting is installed by licensed plumbers or pipefitters following applicable IPC or local plumbing code requirements. Shut off system pressure and depressurize the line before removing or installing any pipe plug. Apply an approved thread sealant or PTFE tape to the male threads before installation. Do not overtighten brass fittings, as brass threads can be damaged by excessive torque.