3/4 inch x 1/2 inch Brass Reducing Adapter Copper x Female

3/4 inch x 1/2 inch Brass Reducing Adapter – Copper x Female Thread, Lead-Free

The 3/4 inch x 1/2 inch brass reducing adapter is a transition fitting used to connect copper tube (solder or sweat) to a reduced-size female-threaded connection in potable water and mechanical piping systems. Manufactured from lead-free brass, this fitting is suitable for both hot and cold water service and conforms to applicable pressure and material standards for domestic plumbing use.

Material Specifications and Standards

Constructed from lead-free brass alloy compliant with NSF/ANSI 61 and 372, the adapter is designed for use in drinking water systems and other regulated applications. It combines a copper cup (socket) on one end with a threaded female NPT outlet on the other, allowing for transition between copper tubing and threaded brass or iron components. Key features include:

• ✅ Material: Lead-Free Brass (typically C69300 or C46500)
• ✅ Connection: Copper Cup x FNPT
• ✅ Certification: NSF/ANSI 61 & 372 for potable water applications
• ✅ Operating Pressure: Up to 200 psi (dependent on system design and installation method)

Technical Specifications

• Nominal Sizes: 3/4 inch copper inlet x 1/2 inch FNPT outlet
• End Types: Solder/sweat cup (ASTM B16.18 dimensions) x NPT thread (ASME B1.20.1)
• Temperature Rating: Up to 200°F in potable water systems
• Application: Residential and commercial water supply systems

Installation Requirements

The copper cup must be prepared using standard soldering techniques with approved flux and lead-free solder. The female threaded outlet should be joined using compatible male threads and an approved thread sealant or PTFE tape. Care must be taken to avoid over-torquing, which may damage threads or cause deformation. Follow applicable local codes and standards for pressurization and leak testing.

Typical Use Cases

This reducing adapter is commonly installed in potable water distribution systems, particularly at fixture branches or equipment connections requiring a size transition between 3/4 inch copper tubing and 1/2 inch NPT-threaded valves, fittings, or appliances. It is suitable for both new construction and retrofit applications where dimensional changes are required in confined spaces.

Code Compliance Note

Lead-free brass fittings are mandated by the Safe Drinking Water Act and are required for use in potable water systems throughout the U.S. This adapter complies with those standards, supporting both IPC and UPC code requirements.