REHAU reducer fitting 25×16 mm — plumbing connection for PEX/PE-RT pipes

REHAU reducer fitting 25×16 mm is a mechanical plumbing connector designed to join PEX and PE-RT pipes with a seamless transition from 25 mm to 16 mm diameter. Intended for use in heating, potable water and general plumbing systems, the fitting delivers a compact, stable connection where a reduction in pipe size is required. The product suits manifold branches, distribution lines and repair points, providing a straightforward way to adapt pipe networks while maintaining flow and system integrity.

Advantages

This REHAU reducer fitting provides a secure mechanical connection between two different pipe diameters without the need for complex tools or adhesive bonding. Its design supports reliable sealing and consistent hydraulic performance in potable water and heating circuits. The compact dimensions allow installation in confined spaces and simplify branch-offs or repairs. Compatibility with PEX and PE-RT materials ensures broad applicability across common polymer plumbing systems.

Suitable for

• Reducing main distribution lines to branch circuits
• Connecting manifold outlets to smaller-diameter risers
• Repairing or modifying existing PEX/PE-RT installations
• Applications in underfloor heating and potable water systems

Key specifications

• Connection diameters: 25 mm to 16 mm
• Compatible pipe types: PEX, PE-RT
• Application areas: heating systems, potable water distribution, general plumbing
• Mechanical joining method suitable for press or compression-style installation (depending on system)
• Compact form factor for use in tight installation spaces

How to use

Prepare pipe ends by cutting square and deburring to ensure a smooth fit. Slide the fitting onto the 25 mm pipe and insert the 16 mm pipe into the opposite end, following system-specific assembly instructions for press, crimp or compression connections as applicable. Verify alignment and engagement depth and perform the recommended joining operation with appropriate tooling. After installation, check for leaks and pressure integrity according to local regulations and system requirements.

Usage recommendations

Use compatible installation tools and follow REHAU or system supplier guidelines for joining PEX and PE-RT pipes. Confirm pipe wall dimensions and manufacturer tolerances before assembly, and perform a pressure test after installation to ensure a reliable, leak-free connection.