VIEGA transition fitting 28 mm x 5/4" brass, model 105839

The VIEGA transition fitting 28 mm x 5/4" in brass (model 105839) is a metal coupling designed to connect a 28 mm pipe to a 5/4" threaded port in water and heating installations. Constructed from brass, the fitting provides a corrosion-resistant connection between different pipe systems and threaded components, ensuring mechanical stability and compatibility with common plumbing materials used in domestic and commercial projects.

Advantages

The brass construction offers good resistance to corrosion and long service life under normal plumbing conditions. The transition design enables a secure mechanical and sealed join between a 28 mm tube and a 5/4" threaded fitting without requiring complex adapters. Manufactured to industry standards by VIEGA, the fitting is suitable for use in systems where metal connectors are preferred for durability and dimensional reliability.

Suitable for

• Connecting a 28 mm copper or metal pipe to a 5/4" threaded valve or fixture
• Use in domestic and light commercial water supply systems
• Integration into heating circuits where a threaded connection is required

Key specifications

• Material: brass, corrosion-resistant
• Connection 1: 28 mm pipe connection (suitable for metal tubes)
• Connection 2: 5/4" external/internal threaded connection
• Application: potable water and heating systems compatibility
• Mechanical design: transition coupling for pipe-to-thread joins

How to use

Prepare the 28 mm pipe end by deburring and cleaning to ensure a proper metal-to-metal contact. Thread the fitting onto the corresponding 5/4" threaded component, applying appropriate sealing method for the thread type used (for example, thread seal tape or approved sealant) if a pressure-tight thread seal is required. Secure the 28 mm pipe into the fitting according to the installation practice for the pipe material—this may involve compression, soldering, or other approved joining techniques compatible with the fitting and pipe type. Verify alignment and tighten connections to manufacturer-recommended torque levels where applicable, then pressure-test the assembly before putting the system into regular operation.

Usage recommendations

Use the fitting only with compatible pipe materials and thread types. Ensure all joints are pressure-tested and inspected for leaks after installation. For systems carrying potable water or operating at elevated temperatures, follow local plumbing codes and VIEGA installation guidelines to maintain safety and long-term performance.