Copper reducing coupler VIEGA 18→15 mm (model 95240, MPN 101176)

Copper reducing coupler VIEGA 18→15 mm is a straight copper fitting designed to join or reduce an 18 mm copper tube to a 15 mm copper tube in plumbing installations. The coupler provides a compact, corrosion-resistant connection suitable for potable water systems and general domestic pipework. It is intended for use where a durable metal join is preferred for repair, extension, or modification of existing copper piping.

Advantages

The coupler is made of copper, offering inherent corrosion resistance and long service life in typical domestic water conditions. Its straight reducing form enables a smooth transition between different tube diameters without added fittings, helping to maintain hydraulic flow and minimize profile size. The simple, robust design allows for reliable soldered or brazed joints and is compatible with standard plumbing practices for copper tube installations.

Suitable for

• Reducing an 18 mm copper pipe to 15 mm in potable water supply lines
• Repairing or replacing short sections of domestic copper pipework
• Modifying heating or chilled water circuits with copper tubing
• Compact installations where space is limited and a straight join is required

Key specifications

• Material: copper
• Connection type: straight reducing coupler for copper tube
• Input diameter: 18 mm
• Output diameter: 15 mm
• Application: potable water and general domestic plumbing

How to use

Prepare the copper tubes by cutting square and deburring the ends. Clean the joint surfaces to bright copper using an appropriate abrasive or cleaning tool. Apply flux suitable for potable water installations if soldering or brazing, then assemble the coupler onto the tubes ensuring full insertion to the shoulder. Heat the joint evenly and apply solder or brazing material following standard plumbing procedures until a continuous fillet forms around the connection. Allow the assembly to cool naturally and remove any residual flux. After cooling, inspect the joint and pressure test the system in accordance with local regulations.

Usage recommendations

Use with copper tubing of matching wall thickness and conforming to applicable local plumbing standards. Ensure compatible flux and solder materials are selected for potable water systems. When installing in concealed locations, follow relevant codes for joint type and leak detection testing.