PPSU pipe fitting REHAU Trójnik red PX 25-16-25 (RAUTITAN) – reducer tee for 25 mm to 16 mm

Reducer tee PPSU pipe fitting REHAU Trójnik red PX 25-16-25 (RAUTITAN) is a three-way connector designed to join two 25 mm supply lines with a 16 mm branch. Manufactured from PPSU (polyphenylsulfone), this fitting is intended for potable water and heating distribution systems where a reliable diameter transition and long-term dimensional stability are required. The fitting is compatible with RAUTITAN push-fit and press connection systems and is suitable for use in domestic and commercial plumbing installations.

Advantages

The PPSU material provides high resistance to heat, hydrolysis and common chemicals found in water systems, ensuring durability and reduced risk of degradation over time. The reducer tee offers secure, leak-resistant connections when installed with compatible RAUTITAN installation methods, and its compact form facilitates installation in confined spaces where a step-down from 25 mm to 16 mm is needed. Its design supports consistent flow transition and minimizes turbulence at the branching point.

Suitable for

• Domestic potable water distribution where main pipe diameters reduce to smaller branch lines
• Underfloor heating manifolds and local heating circuits with mixed pipe diameters
• Commercial plumbing systems requiring durable plastic fittings resistant to thermal cycling
• Renovation projects where existing 25 mm runs feed new 16 mm branches

Key specifications

• Material: PPSU (polyphenylsulfone) for chemical and temperature resistance
• Connection configuration: tee with two 25 mm inlets and one 16 mm outlet
• Application: potable water and heating distribution systems
• Compatibility: designed for RAUTITAN system connections and standard 25 mm / 16 mm pipe dimensions
• Design: compact reducer tee for space-efficient installations

How to use

Prepare the connecting pipe ends by cutting squarely and deburring to ensure clean, smooth surfaces. Follow the RAUTITAN installation instructions for the chosen connection method (push-fit or press) and confirm compatibility with 25 mm and 16 mm pipes. Insert the pipes fully into the fitting until the stop is reached or perform the specified pressing procedure with the correct tool and jaw size. After installation, check all joints visually and, where applicable, perform a pressure test according to local codes and project requirements to verify leak-free connections.

Usage recommendations

Use this REHAU PPSU reducer tee in systems designed for potable water or heating, avoid exposure to aggressive chemicals outside normal water service, and always follow manufacturer instructions and local plumbing standards for handling, joining and pressure testing.