Used for building water supply networks with a nominal water pressure of 16 bar (calculated at 20°C), installed buried in the ground. Manufacturing method: mechanical machining on machines for PE100 electrofusion couplers, with the electrofusion fitting resistance embedded in the material, with dimensions corresponding to SDR 11 (ISO S5), according to EN 12201-3:2011+A1:2012. 4 mm connectors. Welding must be carried out by authorized welders using suitable equipment and in compliance with the welding procedure.