Compression reducing coupling TECE 25 x 20 mm 766505 for plumbing connections

Compression reducing coupling TECE 25 x 20 mm is a plumbing fitting designed to connect pipes with 25 mm and 20 mm outside diameters. It creates a compact and robust transition between larger and smaller pipes and is intended for potable water and heating system installations. The coupling provides a secure compression joint that reduces the need for soldering or solvent welding and is suitable for repair, renovation and new-build plumbing work where a reliable diameter reduction is required.

Advantages

The TECE compression reducing coupling offers a compact design that occupies minimal space in piping runs and installation cavities. Its compression connection ensures a leak-resistant joint when installed correctly, enabling quick assembly without hot works or adhesives. The fitting is compatible with common copper and plastic pipes used in domestic water and heating systems and provides consistent mechanical strength across the transition. The metal and sealing components are selected to maintain performance in potable water applications.

Suitable for

• Connecting 25 mm to 20 mm pipes in potable water installations
• Reducing pipe diameter in heating and radiator circuits
• Repairing or modifying existing piping systems
• New-build plumbing where space is limited

Key specifications

• Connection type: compression reducing coupling between two different pipe diameters
• Pipe diameters: suitable for 25 mm and 20 mm outside diameter pipes
• Application: potable water and heating systems
• Material composition: metal body with elastomeric sealing elements for watertight joints
• Installation method: push-on/insert pipe with compression nut tightening for secure joint
• Design: compact inline reducer for tight installation spaces

How to use

Ensure pipes are clean, straight-cut and free of burrs before installation. Insert the smaller-diameter pipe and the larger-diameter pipe into their respective ends of the coupling until they seat against the internal stops. Tighten the compression nuts by hand and then use a wrench to secure the nuts to the torque recommended by installation standards or the manufacturer's general guidance for compression fittings. After assembly, pressurize the system and inspect the joint for leaks. If any leakage is detected, isolate that section and retighten or replace sealing components as necessary.

Usage recommendations

Use the coupling only with compatible pipe materials and sizes (25 mm and 20 mm) and follow local plumbing codes. Avoid excessive overtightening of the compression nuts to prevent damage to sealing elements. For installations in potable water systems, ensure materials and installation practice comply with drinking water regulations. When used in heating systems, perform a pressure and temperature test according to system requirements.