Merit Brass NLBS117A-04 Brass Square Head Plug 1/4 in

Product Description

The MERIT BRASS NLBS117A-04 is a brass square head pipe plug designed to seal threaded pipe openings in plumbing, HVAC, and industrial piping systems. It features a 1/4 inch MNPT male thread that engages a matching FNPT female fitting, and it is rated at 125 psi at Class 125 service conditions. The square head drive profile allows installation and removal with a wrench or socket without relying on a slotted or hex recess. The plug is fully lead free, meeting requirements for potable water and other lead-sensitive applications. At 0.04 pounds, it is a compact, single-piece brass fitting suited for frequent use by licensed plumbers and pipefitters.

This plug is used wherever a threaded pipe port needs to be capped or blanked off. Common applications include sealing unused tee outlets, test ports, gauge ports, and branch connections in residential and light commercial plumbing, hydronic heating, compressed air, and general fluid service lines. The Class 125 pressure rating makes it appropriate for standard low-pressure service in both water and air systems. It is sold individually with a minimum order quantity of 6 units, making it practical for stocking in a service van or shop inventory.

Key Features

• 1/4 inch MNPT threaded connection engages standard FNPT female fittings
• Square head drive profile for positive wrench grip during installation and removal
• 125 psi pressure rating at Class 125 service conditions
• Lead free construction suitable for potable water applications
• Solid brass body resists corrosion in water, air, and light fluid service
• Lightweight at 0.04 pounds for easy handling and high-volume stocking

Compatibility

Designed as an OEM-style replacement or service fitting for any standard 1/4 inch FNPT threaded port in Class 125 brass, iron, or compatible piping systems.

Installation Notes

A licensed plumber or qualified pipefitter should install this plug in accordance with applicable IPC and local plumbing code requirements. Shut off system pressure and drain the line before removing any existing plug or cap. Apply thread sealant tape or paste rated for the service fluid to the MNPT threads before installation. Do not overtighten; hand-snug followed by wrench tightening to achieve a leak-free seal is standard practice for brass fittings at this size.