Merit Brass X119-24 Brass Pipe Locknut 1-1/2 in Fnpt

Product Description

The MERIT BRASS X119-24 is a brass pipe locknut rated at Class 125, sized for 1-1/2 inch pipe with female NPT (FNPT) end connections. Locknuts are used to secure fittings, nipples, and threaded pipe through panels, bulkheads, or tank walls by threading onto the fitting from the back side and tightening against the surface to create a firm mechanical hold. The Class 125 pressure rating makes this locknut suitable for a wide range of low- to moderate-pressure water, gas, and general plumbing service applications. Brass construction provides corrosion resistance and reliable thread engagement in both commercial and residential piping systems. Plumbers and pipefitters install this type of fitting as part of standard threaded pipe assemblies.

This locknut is designed for use in residential and light commercial plumbing, HVAC condensate systems, water distribution, and general fluid-handling applications where a 1-1/2 inch FNPT threaded locknut is required. It is suited for panel or bulkhead mounting applications where a pipe or fitting must be anchored securely through a wall or enclosure. The FNPT threading is compatible with standard NPT-threaded pipe and fittings commonly found in domestic plumbing and mechanical systems.

Key Features

• 1-1/2 inch fitting size for standard NPT threaded pipe assemblies
• Female NPT (FNPT) end connection on both mating surfaces
• Class 125 pressure rating suitable for low- to moderate-pressure service
• Brass construction offers corrosion resistance and durable thread engagement
• Compact locknut profile for panel and bulkhead mounting applications

Compatibility

Designed as an OEM-style replacement or standard-service locknut for 1-1/2 inch FNPT threaded pipe and fitting assemblies in residential and commercial plumbing systems rated at Class 125.

Installation Notes

Installation is typically performed by a licensed plumber or pipefitter following applicable IPC or local plumbing code requirements. Shut off and depressurize the line before disassembling any threaded connection. Use a pipe wrench or strap wrench to tighten the locknut firmly against the mounting surface without overtightening, which can crack brass fittings. Apply thread sealant tape or compound appropriate for the service fluid before making up the threaded joint.