Merit Brass XNL119-16 Brass Pipe Locknut 1 Inch Fnpt

Product Description

The MERIT BRASS XNL119-16 is a 1-inch brass pipe locknut designed for threaded FNPT connections in plumbing and piping systems. Built to Class 125 standards with a 125 psi pressure rating, this locknut is lead free, making it suitable for potable water applications where code compliance is required. The fitting is constructed from brass, offering reliable corrosion resistance in a wide range of fluid-handling environments. Plumbers and pipefitters install this type of locknut to secure fittings, valves, and supply lines through wall panels, fixture bodies, and mounting plates. The single-piece threaded design provides a straightforward, tool-ready installation.

This locknut is suited for residential and light commercial plumbing applications involving 1-inch FNPT threaded pipe connections. Typical install scenarios include securing supply stops, faucet shanks, and tank connectors where a locking fastener is needed to hold a fitting firmly against a panel or fixture surface. Its lead-free construction meets current regulatory requirements for use in potable water systems.

Key Features

• 1-inch FNPT threaded connection for standard pipe fitment
• Class 125 rated at 125 psi working pressure
• Lead-free brass construction for potable water compliance
• Corrosion-resistant brass material suitable for wet environments
• Threaded design for tool-ready, secure installation

Compatibility

Designed as an OEM-style replacement or new-installation locknut for 1-inch FNPT threaded pipe and fitting assemblies in residential and commercial plumbing systems.

Installation Notes

Installation is performed by a licensed plumber or qualified pipefitter. Shut off the water supply and relieve system pressure before beginning work. Use an appropriate pipe wrench or basin wrench to tighten the locknut snugly against the mounting surface without overtightening the brass threads. Follow applicable local plumbing codes and IPC guidelines for potable water fittings.