Conex reducing coupling 5000 series 28 x 18 mm, copper plumbing fitting

Conex reducing coupling from the 5000 series, size 28 x 18 mm, is a copper plumbing fitting designed to join two copper pipes of different diameters. It creates a mechanical and fluid-tight transition between a 28 mm pipe and an 18 mm pipe, suitable for potable water and heating systems where a reduction is required. The coupling is intended for use in professional plumbing installations, repairs and renovations and is compatible with standard copper tubing sizes.

Advantages

The fitting is made of copper, which ensures corrosion resistance and long-term mechanical stability in water and heating circuits. Its reducing design provides a secure connection between pipes of different diameters without the need for complex adapters. The coupling supports a reliable seal for potable water applications when installed according to established plumbing practices.

Suitable for

• Reducing a 28 mm copper pipe to an 18 mm copper pipe in potable water systems
• Connections in central heating and hot water circulation where diameter change is required
• Repair or renovation work on copper pipe networks in residential and commercial buildings
• Professional plumbing installations where a durable mechanical joint is needed

Key specifications

• Material: copper
• Type: reducing coupling (female/female or compatible connection for copper tubing)
• Connection sizes: 28 mm to 18 mm
• Intended media: potable water and heating fluids
• Application: mechanical joining of copper pipes of different diameters

How to use

Prepare both copper pipe ends by cutting square and deburring the inner and outer edges. Clean the pipe surfaces to remove oxidation and contaminants. Slide the coupling onto one pipe and align the second pipe to the opposite end; follow the specific joining method suitable for the coupling type used (for example, soldering or compression method as applicable). Ensure proper alignment and depth of insertion, then complete the joint according to standard plumbing procedures and local regulations. After installation, pressurize the system and inspect for leaks.

Usage recommendations

Use appropriate personal protective equipment and follow local plumbing codes. Verify compatibility of joining technique (solder, brazing, or mechanical compression) with the specific Conex 5000 series coupling variant you have. When used in potable water systems, flush and disinfect the section after installation if required by regulations.