1-1/4 inch Brass Cored Square Head Plug

1-1/4 inch Brass Cored Square Head Plug – Lead-Free Threaded Closure Fitting

The 1-1/4 inch brass cored square head plug is a threaded closure fitting used to seal the ends of female threaded pipe or fittings in pressure-rated plumbing and mechanical systems. Fabricated from lead-free brass, it provides corrosion resistance and mechanical reliability in both hot and cold water applications.

Performance-Driven Design for Field Applications

This plug is engineered for service termination points, testing ports, or future-access connections within potable water systems and low-pressure hydraulic assemblies. Key attributes include:

• ✅ Threaded Male NPT Design Ensures secure sealing in standard pipe-threaded ports without the need for welding or adhesives.
• ✅ Square Head Profile Allows for wrench access and removal in confined or embedded locations.
• ✅ Lead-Free Brass Body Complies with federal and state mandates for potable water contact (NSF/ANSI 61 and 372).
• ✅ High Machinability and Tolerance Control Manufactured to industry dimensional standards for dependable thread engagement.
• ✅ Corrosion and Scale Resistance Maintains sealing integrity under variable flow, temperature, and environmental conditions.

Product Specifications

• Nominal Size: 1-1/4 inch
• Connection Type: Male NPT (National Pipe Thread), square head
• Material: Lead-free brass
• Compliance: NSF/ANSI 61 and 372 certified

Installation Considerations

Thread sealant or PTFE tape is required during installation to ensure proper sealing and reduce galling or thread seizing. Torque should be applied using a wrench fitted to the square head; overtightening should be avoided to prevent thread distortion or cracking in mating components.

Common Use Cases

Typically installed in municipal, commercial, and residential piping systems, this plug is used to seal unused outlets in tees, valves, or manifolds. It is also used for pressure testing or system isolation during phased construction or repairs.

Material Insight

Brass is widely selected for threaded plumbing applications due to its dimensional stability, resistance to dezincification, and compatibility with both copper and iron pipe systems. The lead-free formulation ensures compliance with potable water safety requirements.

The 1-1/4 inch brass cored square head plug provides a reliable, code-compliant solution for sealing and service access in threaded piping assemblies. Its robust construction and compatibility with common plumbing materials make it a dependable choice for contractors working on high-integrity water or mechanical systems.