Merit Brass XNL117A-06 Brass Square Head Plug 3/8 in

Product Description

The MERIT BRASS XNL117A-06 is a brass square head pipe plug designed to close off threaded pipe ends in plumbing, HVAC, and industrial piping systems. It uses a male NPT (MNPT) external thread that engages a female NPT (FNPT) port or coupling, providing a tight, leak-resistant seal when installed to spec. The Class 125 pressure rating allows use at up to 125 psi in standard service conditions. Constructed from lead-free brass, this plug meets lead-free compliance requirements for potable water and general-purpose piping applications. The square head drive allows installation and removal with a standard wrench, making it practical for tight spaces where a slotted plug would be difficult to turn.

This plug is suited for residential and light commercial plumbing, hydronic heating systems, compressed air lines, and general pipe fitting applications where a threaded port needs to be capped off permanently or temporarily. It is installed by licensed plumbers, pipefitters, and HVAC technicians during new construction, system modifications, or service work requiring port isolation. The 3/8-inch fitting size fits standard 3/8-inch NPT threaded ports commonly found on valves, manifolds, tees, and pipe bodies.

Key Features

• Lead-free brass construction meets potable water compliance requirements
• Class 125 rated to 125 psi for standard service pressure applications
• MNPT x FNPT threaded connection for secure, wrench-tight installation
• Square head drive allows engagement with standard open-end or adjustable wrench
• 3/8-inch fitting size matches common valve and manifold port dimensions

Compatibility

Designed as an OEM-style replacement or new-installation fitting for standard 3/8-inch NPT threaded ports in residential and commercial plumbing and piping systems.

Installation Notes

Installation is performed by a licensed plumber or pipefitter in accordance with applicable IPC or local plumbing code requirements. Depressurize and drain the line before installing or removing any threaded plug. Apply thread sealant tape or compound to the MNPT threads before installation to ensure a leak-free joint. Do not overtighten brass fittings, as the material is subject to thread damage under excessive torque.