Used for building water supply networks with a nominal pressure of 16 bar (calculated at 20°C) and external natural gas transmission networks with a maximum operating pressure MOP = 10 bar (reference temperature 20°C), installed buried in the ground. Manufactured by machine machining for PE100 electrofusion couplings, with the electrofusion fitting resistance embedded in the material, with dimensions corresponding to SDR 11 (ISO S5), in accordance with EN 12201-3:2011+A1:2012 and EN 1555-3:2010+A1:2012. The active clamping system is ensured by the pipe-in-pipe manufacturing technology. In this way, no auxiliary devices are required for installation. Welding voltage: 40 V. 4 mm connectors. Welding must be carried out by authorized welders using suitable equipment and in compliance with the welding procedure. The weld is made in two separate welding zones, which are also welded in a single welding sequence without preheating: one for one end and one for the other end of the coupling.