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.

WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.