Copper transition coupling REHAU 75 x 6.8 to 76.1 x 2.9 for soldered connection

The Copper transition coupling REHAU 75 x 6.8 to 76.1 x 2.9 for soldered connection is a purpose-built fitting that enables a secure metal-to-metal join between two copper pipes with different outer dimensions and wall thicknesses. Designed for plumbing and HVAC installations, this coupling allows installers to connect a thicker-walled pipe (75 x 6.8 mm) to a thinner-walled pipe (76.1 x 2.9 mm) using a soldered joint, ensuring mechanical integrity and reliable fluid flow in systems where a change in pipe geometry is necessary.

Advantages

The coupling delivers a durable soldered connection that resists leakage and maintains strength across differing pipe profiles. Its copper construction provides good thermal and corrosion properties typical of copper piping systems and ensures compatibility with standard soldering procedures. The part is intended to simplify transitions between pipes of closely matched diameters but different wall thicknesses, reducing the need for adapters or complex fabrication on site.

Suitable for

• Plumbing installations requiring a change in wall thickness between copper pipes
• HVAC systems where soldered copper joints are specified
• Repair and retrofit work on existing copper pipe networks
• Situations that demand a metal-to-metal transition coupling with soldered sealing

Key specifications

• Material: copper
• Connection type: soldered (capillary solder joint)
• First pipe outer dimension: 75 mm with 6.8 mm wall thickness
• Second pipe outer dimension: 76.1 mm with 2.9 mm wall thickness
• Application: plumbing and HVAC pipe transitions

How to use

Prepare both pipe ends by cleaning and removing oxidation or debris to ensure proper wetting by solder. Insert the pipe ends into the coupling to the designed stop, apply appropriate flux to the joint area, and heat evenly with a torch until flux activation and solder flow occur. Introduce solder to the joint capillary and allow it to penetrate the interface for a complete seal. After cooling, inspect the joint visually and perform any required pressure or leak tests according to applicable installation standards.

Usage recommendations

Use qualified personnel familiar with soldering copper pipework and follow local codes and safety procedures. Select solder and flux compatible with potable water systems if used in domestic water installations. Ensure adequate ventilation and heat protection for surrounding materials during soldering operations.