Compression socket fitting SiGMA-Li PERTM16T — welded/heat-fused coupling for 16 mm PE-RT pipe

Welded socket coupling SiGMA-Li PERTM16T is a compression/socket fitting engineered for creating permanent, heat-fused joints on 16 mm PE-RT (polyethylene of raised temperature resistance) pipes. Designed for systems that require reliable, leak-resistant connections, this coupling is suitable for potable water and low-temperature heating circuits where PE-RT piping is specified. The fitting forms a continuous polymer bond with the pipe through heat fusion, eliminating mechanical seals and providing a smooth internal bore for minimal flow resistance.

Advantages

The welded/heat-fused design ensures a durable, tamper-resistant joint that resists seepage and reduces the risk of joint failure compared with mechanical compression alternatives. Compatibility with 16 mm PE-RT pipe delivers a consistent fit and predictable thermal behaviour in heating and water supply systems. The coupling's smooth internal profile keeps hydraulic losses low and supports hygienic potable water transport when installed according to standards.

Suitable for

• Underfloor heating manifolds and circuits using 16 mm PE-RT pipe
• Radiator loop connections in low-temperature heating systems
• Domestic potable water supply lines with PE-RT piping
• Repair or extension of existing PE-RT installations where a permanent fused joint is required

Key specifications

• Pipe compatibility: 16 mm PE-RT (polyethylene of raised temperature resistance)
• Connection method: heat fusion / welded socket coupling
• Intended media: potable water and low-temperature heating fluids
• Joint type: permanent, fusion-welded connection with smooth internal bore

How to use

Prepare the PE-RT pipe by cutting squarely and ensuring the ends are clean and free of debris. Heat the pipe end and the internal surface of the coupling according to the heat-fusion procedure recommended for PE-RT materials and the heating equipment being used. Insert the pipe fully into the coupling to the correct depth and allow the joint to cool under minimal movement to achieve a uniform fusion bond. Follow local codes and the heat-fusion equipment manufacturer's instructions for temperatures, heating times and safety precautions.

Usage recommendations

Use certified heat-fusion tools suitable for PE-RT to ensure consistent joint quality. Verify compatibility of the coupling with the specific PE-RT pipe variant in the installation, and allow adequate cooling time before pressurising the system. For potable water applications follow applicable sanitary and installation standards.