Compression fitting SiGMA-Li PERTZW2534 — welded coupling 25x3/4 for PE-RT piping

Welded coupling SiGMA-Li PERTZW2534 is designed for secure transitions between 25 mm PE-RT (polyethylene of raised temperature resistance) piping and 3/4" threaded fittings. Intended for use in plumbing and heating systems, this coupling enables a reliable connection from a 25 mm PE-RT pipe to standard 3/4-inch threaded components. The product is suitable for potable water distribution as well as underfloor heating and radiator circuits where PE-RT tubing is specified.

Advantages

The SiGMA-Li welded coupling provides a compact and robust junction that minimizes the risk of leaks at the pipe-to-thread interface. Its design ensures compatibility with 25 mm PE-RT pipe and standard 3/4" threaded fittings, offering ease of integration into existing plumbing and heating layouts. The coupling supports systems where elevated temperature stability and long-term reliability are required, and it allows for a straightforward joining method when used with the appropriate welding tools and procedures.

Suitable for

• Connections between 25 mm PE-RT pipe and 3/4" threaded valves or fittings
• Domestic potable water distribution with PE-RT piping
• Underfloor heating manifolds and circuits using PE-RT tubing
• Radiator supply/return lines where a threaded transition is required

Key specifications

• Pipe connection size: 25 mm (PE-RT)
• Threaded fitting size: 3/4 inch (female/male as required by installation)
• Material compatibility: PE-RT piping systems
• Application: potable water and heating circuits
• Connection type: welded coupling for transition to threaded fittings

How to use

Prepare the 25 mm PE-RT pipe by cutting squarely and deburring the end. Follow the manufacturer's welding or joining instructions for PE-RT to weld the coupling onto the pipe end, ensuring correct temperature and pressure settings for a reliable joint. After the welded connection has cooled and been inspected, attach the 3/4" threaded fitting or valve, using appropriate sealing methods on the thread if required by the fitting type and application. Perform a pressure test of the assembled section according to local plumbing and heating standards.

Usage recommendations

Use the SiGMA-Li coupling with PE-RT pipes and compatible 3/4" threaded fittings only. Verify that the system's operating temperatures and pressures fall within the PE-RT material limits and follow relevant installation standards. Regularly inspect joints after installation and carry out pressure testing before commissioning.