Merit Brass BS118HC-04 Brass Countersunk Plug 1/4 in

Product Description

The MERIT BRASS BS118HC-04 is a brass countersunk pipe plug designed to seal threaded pipe openings in low-pressure fluid and gas systems. It features a male NPT (MNPT) external thread and a female NPT (FNPT) internal socket, allowing the plug face to sit flush or recessed within a fitting or manifold port. At a 1/4 inch fitting size and Class 125 pressure rating, this plug is a standard choice for capping off unused branch ports in plumbing, HVAC, and light industrial piping assemblies. Brass construction provides solid corrosion resistance for most water and air service applications. Installation is performed by licensed plumbers, pipefitters, or HVAC technicians.

This countersunk plug is suited for residential and light commercial plumbing, hydronic heating systems, compressed air lines, and similar threaded pipe assemblies where a low-profile, flush-mount port closure is required. The MNPT x FNPT thread configuration makes it compatible with standard NPT-threaded fittings and manifold blocks. It is sold individually, with a minimum order quantity of 6 units per order.

Key Features

• Countersunk design allows plug face to sit flush or below the mating surface for a clean, low-profile seal
• 1/4 inch fitting size in Class 125 rating for standard low-pressure pipe service
• MNPT x FNPT thread configuration for direct engagement with NPT-threaded ports
• Brass material provides corrosion resistance in water, air, and compatible fluid service
• Threaded connection — no solder, press, or specialty tooling required

Compatibility

Designed as an OEM-style replacement or new-installation fitting for standard 1/4 inch NPT-threaded pipe ports in residential and light commercial plumbing and HVAC piping systems.

Installation Notes

Installation is typically performed by a licensed plumber or pipefitter working with NPT-threaded pipe assemblies. Shut off and depressurize the system fully before removing or installing any pipe plug. Apply an appropriate thread sealant or PTFE tape to the MNPT threads per local plumbing code requirements. Do not overtighten brass fittings, as brass threads can be damaged by excessive torque.