VIEGA transition coupling 28 mm x 5/4" soldered – model 107192

VIEGA transition coupling 28 mm x 5/4" soldered – model 107192 is a plumbing fitting that provides a sealed mechanical connection between a 28 mm copper or compatible pipe and a 5/4" female threaded component. The coupling is supplied as a soldered fitting designed for installation in water supply and heating systems where a reliable transition from piping to threaded fixtures is required. Intended for use in repair, retrofit, and new installations, the coupling offers a compact solution for adapting metric copper pipework to larger imperial-threaded valves or fittings.

Advantages

The soldered joint design ensures a permanent, leak-resistant connection when properly installed, reducing the need for additional sealing materials. One side accepts a 28 mm copper pipe for capillary or ring-soldering, while the opposite side provides a 5/4" female thread for direct assembly with threaded valves or components. The fitting is manufactured to industry standards for dimensional compatibility and mechanical strength, enabling consistent performance in potable water and central heating installations.

Suitable for

• Connecting 28 mm copper pipe to 5/4" threaded valves or fittings
• Repairing or replacing sections in water distribution systems
• Retrofit work where metric-to-imperial transitions are required
• Domestic and commercial heating system connections

Key specifications

• Connection A: 28 mm solderable socket for copper or compatible piping
• Connection B: 5/4" female threaded connection
• Material: corrosion-resistant metal suitable for potable water and heating systems
• Type of joint: soldered connection on the 28 mm side
• Application: water supply and central heating installations

How to use

Prepare the copper pipe end by cutting square and cleaning the outer surface and socket to remove oxides and contaminants. Apply appropriate flux to the joint area, insert the pipe into the 28 mm socket, and heat evenly until solder flows and forms a continuous fillet around the joint. Allow the assembly to cool naturally before testing. Thread the 5/4" side to the mating component using suitable thread sealing practice for the system (for example, approved tape or jointing compound where applicable) and tighten to the recommended torque for the connected component.

Usage recommendations

Use only qualified solder and flux materials compatible with potable water or heating applications. Verify compatibility of connected materials and follow local plumbing codes and manufacturer installation instructions. Test the system for leaks and pressure according to applicable standards after installation.