Merit Brass X119-08 Brass Pipe Locknut 1/2 in Fnpt

Product Description

The MERIT BRASS X119-08 is a brass pipe locknut designed to secure fittings, bushings, and other threaded components in piping assemblies. It features female NPT (FNPT) threading on both ends and is rated for Class 125 service at 125 psi. The locknut is used to lock threaded fittings in place within a pipe system, preventing rotation or loosening under pressure and vibration. This component is installed by licensed plumbers and pipefitters working on water supply, fluid transfer, and general process piping systems. It is a standard threaded connection type and weighs 0.1 pounds.

This locknut is suited for residential and light commercial plumbing applications where a 1/2 inch FNPT threaded connection is required. Common install scenarios include securing nipples through panels or enclosures, locking fittings on water heaters, pumps, and manifold assemblies, and other light-duty piping configurations where vibration resistance is needed. The Class 125 pressure rating makes it appropriate for low-to-medium pressure water and compatible fluid service lines.

Key Features

• 1/2 inch FNPT threaded connection for standard pipe compatibility
• Class 125 rating at 125 psi for low-to-medium pressure service
• Brass construction provides corrosion resistance in wet plumbing environments
• Threaded design allows tool-free hand-start installation before final tightening
• Compact and lightweight at 0.1 pounds for easy handling in tight spaces

Compatibility

Designed as an OEM-style replacement or new-installation component for 1/2 inch FNPT threaded pipe systems rated at Class 125 service.

Installation Notes

Installation is performed by a licensed plumber or pipefitter following applicable IPC and local plumbing code requirements. Shut off the water supply and depressurize the line before working on any threaded pipe connections. Use a pipe wrench or basin wrench to achieve a secure final torque on the locknut without over-stressing the brass threads. Apply thread sealant tape or compound to mating threads as required by the fitting configuration and service conditions.