VIEGA reducing tee 22x15x15 mm pipe fitting

The VIEGA reducing tee 22x15x15 mm pipe fitting is a three-way connector designed to integrate a 22 mm main line with two 15 mm branches in residential and light commercial plumbing and heating systems. It enables a controlled reduction of pipe diameter where a single supply line must feed smaller-diameter circuits. The fitting is intended for use in potable water distribution, central heating circuits and manifold connections, subject to compatibility with the material and system pressure.

Advantages

This reducing tee provides a reliable and compact solution for joining pipes of different diameters while maintaining hydraulic continuity. Manufactured by VIEGA, it is designed for straightforward installation and consistent dimensional accuracy to ensure proper seating with compatible pipes and joining methods. The fitting reduces the need for multiple adapters and streamlines pipeline routing when stepping down from 22 mm to 15 mm.

Suitable for

• Potable water distribution lines where a reduction to 15 mm is required
• Domestic central heating circuits and radiator branches
• Manifold connections and distribution risers in residential systems

Key specifications

• Main branch diameter: 22 mm
• Side branch diameters: 15 mm and 15 mm
• Three-way tee configuration for diameter reduction
• Compact form factor suitable for confined installation spaces
• Designed for use with compatible pipe materials and joining techniques typical for VIEGA systems

How to use

Prepare the pipeline by cutting and deburring the pipes to the correct lengths. Select a compatible joining method and ensure the mating pipe ends and the fitting are clean and free of debris. Install the reducing tee by aligning the 22 mm main branch and the two 15 mm outlets with the corresponding pipes; use the manufacturer's recommended joining technique and follow standard installation practice for torque, alignment and support. Verify that connections are secure and pressure-test the system in accordance with local codes and project specifications.

Usage recommendations

Confirm material compatibility with the system medium (potable water, heating fluid) and operating temperatures and pressures. Support adjacent pipe runs to prevent undue mechanical stress on the reducing tee, and follow VIEGA or system manufacturer's guidelines for installation, testing and maintenance.