Merit Brass XNL119-20 Brass Pipe Locknut 1-1/4 in Fnpt

Product Description

The MERIT BRASS XNL119-20 is a lead-free brass pipe locknut designed to secure threaded fittings, bushings, and nipples in plumbing and piping assemblies. Sized at 1-1/4 inches with female national pipe taper (FNPT) end connections, this Class 125 locknut is rated to 125 psi and is manufactured from brass for corrosion resistance in water service applications. It is installed by licensed plumbers and pipefitters in both residential and light commercial systems where a threaded mechanical lock is required to prevent backing out of fittings under pressure or vibration.

This locknut is suited for use in water supply, drainage, and general piping applications where a 1-1/4-inch FNPT threaded connection is present. Its lead-free construction meets requirements for potable water contact under applicable safe drinking water regulations. Typical scenarios include securing fittings at panel penetrations, tank connections, and equipment inlets in residential plumbing systems and light commercial mechanical rooms.

Key Features

• Lead-free brass construction meets potable water compliance requirements
• 1-1/4 inch FNPT end connection for standard threaded pipe systems
• Class 125 rating with 125 psi working pressure
• Brass material provides corrosion resistance in water service environments
• Compact locknut profile for use in tight or panel-mounted installations

Compatibility

Designed as an OEM-style replacement or new-installation locknut for 1-1/4-inch FNPT threaded pipe and fitting assemblies in standard Class 125 brass piping systems.

Installation Notes

Installation is performed by a licensed plumber or pipefitter. Shut off the water supply and depressurize the line before removing or installing any threaded fittings. Apply thread sealant tape or compound appropriate for the service type before threading the locknut onto the mating fitting. Follow local plumbing codes, including applicable IPC or state-adopted code requirements, for threaded joint assembly and potable water component use.