Connector reducer VIEGA 35x28 model 346621 for plumbing systems

VIEGA connector reducer 35x28 model 346621 is a metal plumbing fitting designed to join two pipes of different diameters, providing a stable hydraulic connection between a 35 mm line and a 28 mm line. Intended for potable water and heating systems, this reducer ensures a secure, leak-resistant transition when adapting pipework to different sizes in domestic or commercial installations.

Advantages

The VIEGA connector reducer offers a compact, robust solution for size transitions in pipe systems. Manufactured to VIEGA quality standards, it delivers reliable sealing and mechanical stability while minimizing pressure loss across the connection. Its straightforward design enables quick integration into existing circuits and reduces the need for complex fittings or additional adapters.

Suitable for

• Potable water supply lines where a 35 mm pipe must be reduced to 28 mm
• Domestic and commercial heating systems requiring size adaptation
• Repair or modification of existing plumbing circuits with mixed pipe diameters
• Hydraulic connections in service runs, risers, and manifold branches

When it may not be suitable

This reducer is intended specifically for adapting between 35 mm and 28 mm pipework; it is not suitable where different diameters are required. It may not be appropriate for applications that demand flexible coupling, vibration isolation or where thermal expansion movement is large, since rigid reducers do not provide flexibility. For systems with aggressive chemical exposure or exceptionally high temperatures, material compatibility should be verified.

Key specifications

• Connection sizes: 35 mm to 28 mm
• Application: potable water and heating systems
• Function: rigid reducer for hydraulic line transitions
• Typical installation: inline between pipes of different diameters

How to use

Install the VIEGA connector reducer by preparing both pipe ends to the required dimensions and cleanliness, ensuring proper alignment. Depending on the pipe material and system type, use the recommended joining method (e.g., press-fit, soldering, or threaded connection) compatible with the reducer design. Verify seating and seal engagement, then pressure-test the circuit according to local plumbing codes to confirm leak-free operation before putting the system into regular use.

What to consider before purchase

• Confirm pipe outer diameters are 35 mm and 28 mm to match the reducer
• Check compatibility of joining method with your pipe material (copper, stainless, PEX, etc.)
• Ensure the reducer material and construction meet potable water and heating system requirements
• Assess whether a rigid reducer is acceptable given thermal movement and vibration in the system

Usage recommendations

Follow manufacturer instructions and local plumbing standards for installation and pressure testing. Use appropriate tools and verify material compatibility to ensure a durable, leak-free transition between 35 mm and 28 mm pipes.