Reducer fitting Alkotest MZR2016 PEX 20x16 mm connection, brass PEX adapter

Alkotest MZR2016 PEX 20x16 mm connection, brass PEX adapter is a compact reducer fitting designed to join 20 mm and 16 mm PEX pipes in potable water and heating systems. The brass body provides mechanical strength and corrosion resistance, while the PEX-compatible geometry ensures a secure, leak-resistant transition between different pipe diameters. The fitting is intended for use where a reliable reduction in pipe size is required without adding excessive bulk to the installation.

Advantages

The reducer fitting offers a compact form factor that simplifies installations in confined spaces and behind fixtures. Brass construction contributes to long-term mechanical stability and resistance to standard water conditions. The connection geometry is engineered for a tight fit with PEX piping, reducing the likelihood of leaks and minimizing the need for rework. Its design supports both potable water and central heating applications, providing versatility across common plumbing tasks.

Suitable for

• Reducing PEX piping from 20 mm to 16 mm in domestic and commercial plumbing
• Potable water distribution systems
• Underfloor heating manifolds and radiator connections where diameter transition is required
• Repair or modification of existing PEX installations

Key specifications

• Connection: reducer from 20 mm to 16 mm for PEX pipe
• Material: brass body suitable for plumbing use
• Application: potable water and heating systems
• Form factor: compact adapter for space-constrained installations
• Compatibility: designed for use with standard PEX piping

How to use

Select the appropriate section of PEX piping and prepare pipe ends according to standard plumbing practice—cut squarely and deburr if necessary. Slide any required sleeve, ring or crimp fitting components onto the pipe per the PEX system being used, insert the pipe fully onto the reducer fitting until it seats against the internal stop, then complete the mechanical joining method specified for the system (crimp, clamp, press or expansion) ensuring a consistent, secure connection. Test the completed joint under working pressure as part of the system commissioning.

Usage recommendations

Use the fitting only with compatible PEX pipes and with the appropriate joining tools and fittings for your PEX system. Ensure installation follows applicable plumbing codes and manufacturer instructions for leak testing and pressure limits. In applications with aggressive water chemistry or where additional corrosion protection is required, consider system-level measures rather than relying solely on component material.