Brass Reducing Coupling TECE 25 x 20 mm – plumbing fitting

TECE brass reducing coupling 25 x 20 mm is a compact plumbing fitting designed to join pipes or fittings with different outside diameters. Manufactured from brass to resist corrosion and mechanical wear, this reducer provides a secure transition from 25 mm to 20 mm lines in potable water, heating and general plumbing installations. The coupling is intended for use where a reliable, space-saving connection is required and can be installed in concealed or exposed pipe runs.

Advantages

The brass construction ensures corrosion resistance and dimensional stability under normal plumbing conditions. Its compact form factor minimises space required for installations and fittings. The coupling offers consistent sealing performance when used with compatible pipe materials and connection methods, and it is suitable for repeated assembly and disassembly during maintenance. Designed by TECE, the fitting meets standard requirements for domestic and light-professional plumbing work.

Suitable for

• Reducing a 25 mm water or heating line to 20 mm in domestic installations
• Connection between different-diameter copper, brass or compatible plastic fittings where a rigid metal reducer is needed
• Use in concealed installation spaces, manifolds and tight-access areas
• Repair or alteration of existing pipe runs requiring a compact reducer

Key specifications

• Material: brass for corrosion resistance
• Connection sizes: 25 mm to 20 mm (outer diameters)
• Form factor: compact reducing coupling suitable for inline installation
• Typical applications: potable water and heating system connections
• Operating environment: domestic and light-commercial plumbing use

How to use

Prepare the pipe ends by cutting squarely and deburring to ensure full contact with the coupling. Select compatible pipes or fittings and, if required by the connection method, apply sealing material or use the recommended joint technique for the pipe type. Insert the 25 mm side onto the larger pipe and the 20 mm side onto the smaller pipe until fully seated. Secure the joint according to the pipe system’s standards—this may include compression fittings, soldering, or appropriate mechanical fastening depending on the installation practice and material compatibility. Verify the connection for alignment and pressure integrity before placing the system into regular operation.

Usage recommendations

Use the TECE reducing coupling only with compatible pipe materials and approved joining methods. Verify system pressure ratings and local plumbing codes before installation. For long-term reliability, perform a pressure test after installation and inspect periodically for signs of leakage or corrosion.