Merit Brass X119-20 Brass Pipe Locknut 1-1/4 in Fnpt

Product Description

The MERIT BRASS X119-20 is a brass pipe locknut designed to secure fittings, bushings, and fixtures to threaded pipe assemblies. It features female NPT (FNPT) threading on both ends and carries a Class 125 pressure rating, making it a dependable choice for low-to-medium pressure plumbing and piping systems. The 1-1/4 inch fitting size suits a wide range of residential and light commercial applications. Licensed plumbers and pipefitters install this locknut as part of standard threaded pipe work, tightening it against a panel, flange, or fitting body to prevent loosening under vibration or line pressure.

This locknut is used in residential and light commercial plumbing installations where a threaded brass component is needed to lock a fitting or fixture in place. Common applications include fixture supply connections, panel penetrations, and general pipe assembly work involving 1-1/4 inch NPT threaded connections. It is suited for water service lines and other compatible fluid systems within the pressure limits of the Class 125 rating.

Key Features

• 1-1/4 inch fitting size for standard pipe assemblies
• FNPT threading on both ends for straightforward threaded connections
• Class 125 pressure rating suitable for low-to-medium pressure systems
• Brass construction provides corrosion resistance in plumbing environments
• Compact locknut profile for use in tight panel or fixture installations

Compatibility

Designed as an OEM-style replacement or standard-service locknut for 1-1/4 inch FNPT threaded pipe assemblies in Class 125 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. Shut off water supply and relieve system pressure before disassembling any threaded connection. Use a pipe wrench or strap wrench to seat the locknut firmly without over-torquing the brass threads. Apply thread sealant tape or compound as appropriate for the service fluid and connection type.