Merit Brass X119-16 Brass Pipe Locknut 1 in Fnpt Class 125

Product Description

The MERIT BRASS X119-16 is a brass pipe locknut designed for secure, threaded pipe connections in plumbing and mechanical systems. Sized at 1 inch with female National Pipe Thread (FNPT) end connections, it is rated for Class 125 service at 125 psi. Locknuts of this type are used to lock fittings, valves, and adapters against a panel, tank wall, or mating fitting to prevent loosening under vibration or pressure. Constructed in brass, the part resists corrosion in both water and light gas service applications. Licensed plumbers and pipefitters are the primary installers of this component.

This locknut is suited for residential and light commercial plumbing installations where a threaded brass fitting is required to secure a component through a panel or bulkhead. Typical applications include water supply systems, compressed air distribution, and general fluid handling where Class 125 pressure ratings are sufficient. The FNPT thread standard ensures compatibility with standard NPT pipe and fittings commonly stocked in trade supply.

Key Features

• 1 inch FNPT threaded connection for standard NPT pipe compatibility
• Class 125 pressure rating at 125 psi for light-duty service
• Brass construction provides corrosion resistance in water and fluid systems
• Threaded connection type allows tool-assisted tightening without welding or soldering
• Compact locknut profile for use in panel-mount and bulkhead applications

Compatibility

Designed as an OEM-style replacement or new-installation locknut for standard 1 inch NPT threaded pipe systems rated to Class 125 service.

Installation Notes

Installation should be performed by a licensed plumber or qualified pipefitter in accordance with applicable IPC and local plumbing codes. Shut off and depressurize the affected line before disassembling or installing any threaded fittings. Apply a compatible thread sealant or PTFE tape to the NPT threads prior to assembly. Do not overtighten brass fittings, as the material is susceptible to cracking under excessive torque.