Compression welded coupling SiGMA-Li GZ. 25x1 for PE-RT pipes

Welded coupling SiGMA-Li GZ. 25x1 for PE-RT pipes is a metal compression-style fitting designed to join PE-RT (polyethylene of raised temperature resistance) pipes with a 25 mm nominal diameter and a 1" thread equivalence. The coupling creates a pressure-resistant connection suitable for potable water and heating circuits, including underfloor heating. Intended for installation by trained professionals, the fitting is compatible with standard PE-RT pipe dimensions and common compression/welding techniques used in plumbing and HVAC systems.

Advantages

The coupling combines a corrosion-resistant metal body with a geometry engineered for stable compression and leak-free performance under thermal cycling. Its design reduces the risk of joint movement or loosening when used in pressurised potable water and heating systems. The product supports reliable long-term operation in closed-loop heating and domestic water supply installations when installed according to manufacturer and industry guidelines.

Suitable for

• Connecting 25 mm PE-RT pipes in potable water distribution
• Joining PE-RT pipes in underfloor heating manifolds and circuits
• Repairing or modifying plumbing runs where a threaded interface is required
• Applications requiring a compact, pressure-rated metal coupling for polymer pipes

Key specifications

• Compatible pipe material: PE-RT (polyethylene of raised temperature resistance)
• Nominal pipe diameter: 25 mm
• Thread equivalence: 1" (threaded interface size equivalence for connection)
• Connection type: compression/welded metal coupling for polymer pipes
• Typical applications: potable water systems, heating circuits, underfloor heating
• Suitable for professional installation with appropriate tools

How to use

Prepare pipe ends by cutting squarely and deburring to ensure full insertion and even compression. Slide the coupling components onto the pipe and assemble according to the connection method specified by the installer—either by compression tightening or the approved welding technique for PE-RT systems. Verify that the pipe is fully inserted to the correct depth and that compression nuts or welding collars are positioned as required. After assembly, perform a pressure test in line with local regulations and project specifications to confirm leak tightness before commissioning.

Usage recommendations

Use only with PE-RT pipes of compatible dimensions and wall thickness; follow relevant standards and the pipe manufacturer's guidelines. Installations should be executed by qualified personnel using correct compression torque settings or welding parameters. Avoid exposure to incompatible chemicals and mechanical stresses that exceed system design limits. Conduct pressure and temperature testing after installation and integrate proper thermal expansion allowances in heating circuits.