Straight union with half-nut Herz P701641 16x2 G 3/4 flat sealing

Straight union with half-nut Herz P701641 16x2 G 3/4 flat sealing is a mechanical coupling designed for creating sealed threaded connections between a 16x2 mm pipe and components with a G 3/4 external thread. Manufactured by Herz for heating and plumbing installations, this union features a half-nut body and a flat sealing surface to ensure a reliable seal when joining copper or compatible plastic pipes to fittings, valves or appliances that accept a G 3/4 thread.

Advantages

The half-nut design allows for secure and compact assembly without requiring rotation of the attached fitting, simplifying installation in confined spaces. The flat sealing surface provides consistent contact pressure for leak-resistant joints when properly installed with the correct gasket or sealing material. Constructed to industry plumbing standards, the union offers dimensional compatibility with 16x2 piping and common G 3/4 threaded connections, aiding straightforward integration into existing heating and plumbing systems.

Suitable for

• Joining 16x2 mm copper pipes to fittings or valves with G 3/4 external threads
• Connecting plastic pipes (where compatible) to threaded heating system components
• Retrofit and repair work in heating and plumbing installations where a flat-sealed union is required

Key specifications

• Pipe connection size: 16x2 mm
• Threaded end: external G 3/4
• Seal type: flat sealing surface (requires appropriate gasket/seal)
• Design: straight union with half-nut
• Application: heating and plumbing pipe connections

How to use

Prepare the 16x2 mm pipe by cutting squarely and deburring the end to ensure full contact with the union seating. Fit the appropriate gasket or sealing element onto the flat sealing surface according to manufacturer guidance. Slide the union body and half-nut into place, engage the G 3/4 external thread by hand to avoid cross-threading, then tighten to the specified torque or until a firm, leak-free fit is achieved. After assembly, pressure-test the connection following local installation standards and correct any leaks by re-seating or replacing the sealing gasket if necessary.

Usage recommendations

Use a gasket or flat sealing washer compatible with the fluids and temperatures in your system. Avoid over-tightening the union; follow torque recommendations from Herz or general plumbing practice. For plastic pipe installations, verify material compatibility and use proper pipe insert or reinforcement if recommended to maintain a secure mechanical connection.