3/4 inch x 1/8 inch Copper Reducing Coupling Copper x Copper

3/4 inch x 1/8 inch Copper Reducing Coupling – Compact Transition Fitting for DWV and Pressure Systems

The 3/4 inch x 1/8 inch copper reducing coupling is a compact transition fitting used to join two copper pipes of dissimilar diameters. Constructed from wrought copper, it offers corrosion resistance and mechanical strength suitable for a range of plumbing systems, including pressure and drainage applications when specified for the appropriate use.

This coupling is engineered for soldered joints and is commonly used where space limitations require a reduced profile without sacrificing joint integrity. The concentric design facilitates smooth flow transition, helping to minimize turbulence and potential pressure drop at the connection.

Key Performance Characteristics

• ✅ Material: Wrought copper per ASTM B75 or B88, lead-free and NSF 61 certified
• ✅ Size: 3/4 inch nominal inlet x 1/8 inch nominal outlet
• ✅ Connection Type: Solder cup x Solder cup (C x C)
• ✅ Temperature & Pressure: Suitable for use in systems up to 200 PSI at 180°F (with proper installation)
• ✅ Code Compliance: Meets applicable ANSI/ASME and UPC plumbing standards

Installation Considerations

For soldered installation, surfaces must be properly cleaned and fluxed. Heat should be evenly applied, and lead-free solder used to ensure a strong and code-compliant joint. As with all reducing fittings, ensure downstream components are pressure-rated accordingly. Avoid over-torquing or mechanical stress during pipe alignment to maintain structural integrity.

Common Applications

This reducing coupling is used in confined areas such as wall cavities, equipment enclosures, or behind fixtures where standard fittings are too large. Typical systems include hydronic heating, potable water supply, and non-pressurized drain-waste-vent (DWV) configurations where permitted.

Note:

Copper fittings should only be installed on compatible tubing types. Verify pipe schedules and system specifications before use to ensure compatibility and proper sizing.