These are used for water supply networks with a nominal pressure of 10 bar (calculated at 20°C), installed underground. The manufacturing method involves mechanical processing on machines for PE100 electrofusion couplings, with the electrofusion fitting’s resistance embedded in the material, corresponding to SDR 17 (ISO S8), in accordance with EN 12201-3:2011+A1:2012 and EN 1555-3:2010+A1:2012. The active clamping system is ensured by pipe-in-pipe manufacturing technology. This eliminates the need for auxiliary devices during installation. Welding voltage: 40 V. Connectors: 4 mm. Welding must be performed by authorized welders using appropriate equipment and adhering to the welding procedure. Welding is carried out in two separate welding zones, which are also welded in a single, non-preheated sequence, one for each end of the coupling.