Used for water supply networks with a nominal pressure of 10 bar (calculated for 20°C temperature), installed buried in the ground. Manufacturing method by mechanical processing on machines for PE100 electrofusion couplings, with electrofusion fitting resistance embedded in material with dimensions corresponding to SDR 17 (ISO S8), according to EN 12201-3:2011+A1:2012 and EN 1555-3:2010+A1:2012. Electrofusion couplings include a reinforcement system with active grip on the pipe. The active grip system is ensured by pipe-in-pipe manufacturing technology. Thus, no auxiliary devices are required for installation. Welding voltage 40 V. 4 mm connectors. Welding indicators with limited displacement. Welding must be performed by authorized welders with appropriate equipment and in compliance with the welding procedure.