Merit Brass NLBS118HC-04 Brass Countersunk Plug 1/4 in

Product Description

The MERIT BRASS NLBS118HC-04 is a 1/4 inch brass countersunk pipe plug designed to close off threaded pipe openings in low-pressure piping systems. It connects via male NPT (MNPT) external threads that seat into a female NPT (FNPT) port, and the countersunk head allows the plug to sit flush or below the surface when fully installed. Rated for 125 psi at Class 125, this plug is manufactured lead free, making it suitable for potable water and other regulated fluid systems. At 0.02 pounds, it is a small but precise fitting intended for plumbing, HVAC, and light industrial piping applications.

This countersunk plug is used to seal unused branch ports, test ports, or dead-end connections on threaded pipe assemblies. It is well suited for residential and light commercial plumbing rough-in work, hydronic heating systems, compressed air lines, and general-purpose fluid handling at or below 125 psi. Plumbers and pipefitters install this fitting during rough-in stages or system modifications where a clean, flush termination is needed on an NPT-threaded opening.

Key Features

• Lead free construction meets requirements for potable water applications
• Class 125 pressure rating at 125 psi for low-pressure piping systems
• Countersunk head profile allows flush or recessed seating at the installation surface
• MNPT x FNPT threaded connection for standard NPT pipe fittings
• Brass material provides corrosion resistance in water, air, and mild fluid service

Compatibility

Designed as an OEM-style threaded pipe plug for standard 1/4 inch NPT female-ported fittings, valves, and pipe assemblies rated at Class 125 or lower.

Installation Notes

Installation is performed by licensed plumbers or qualified pipefitters working on threaded pipe systems. Shut off and depressurize the piping system fully before removing or installing any threaded plug. Apply an appropriate thread sealant or PTFE tape to the MNPT threads before seating to ensure a leak-free connection. Follow applicable IPC and local plumbing codes for potable water and pressure piping installations.