Copper reducing coupling VIEGA 28/22 mm (muff) model 102111

Copper reducing coupling VIEGA 28/22 mm (muff) model 102111 is a solderable plumbing fitting designed to join copper pipes of different diameters. It creates a secure transition between a 28 mm and a 22 mm copper tube and is intended for use in water supply and heating circuits where durable metallic connections and corrosion resistance are required.

Advantages

The coupling is made of copper, which ensures good thermal conductivity and resistance to corrosion in typical potable water and heating environments. Its solderable design provides a permanent, leak-resistant joint when installed correctly by soldering or brazing. The simple cylindrical shape allows easy alignment of pipes and reduces the need for additional adapters or sealing elements.

Suitable for

• Connecting 28 mm to 22 mm copper pipes in domestic plumbing
• Repairing or extending heating circuits that use copper tubing
• Hot and cold water distribution systems in residential and light-commercial buildings
• Applications requiring a corrosion-resistant metal joint

Key specifications

• Material: copper
• Connection type: solderable (muff / socket)
• Compatible pipe diameters: 28 mm and 22 mm
• Shape: reducing cylindrical coupling
• Typical applications: potable water and heating systems

How to use

Prepare pipe ends by cutting square and removing burrs and oxides. Clean the outer surface of the male pipe ends and the inner surfaces of the coupling with an appropriate abrasive or chemical cleaner suitable for copper to ensure proper solder adhesion. Apply flux to the joint surfaces, insert the pipes fully into the coupling until they bottom out, and heat the joint evenly with a suitable torch. Feed solder into the heated seam until a continuous fillet forms around both pipe connections. Allow the joint to cool naturally and then inspect for a uniform solder bead and signs of leaks before placing the system into service.

Usage recommendations

Use appropriate personal protective equipment and follow local codes for potable water and heating installations. Select solder and flux that are compatible with copper piping and approved for potable water if used for drinking water systems. Ensure the system is pressure-tested after installation and follow recommended temperature and pressure limits for copper pipework.