These are used for natural gas networks, as well as for drinking water supply installations, made of high-density polyethylene pipes with thicknesses corresponding to SDR 11 SDR17 according to EN 12201-3:2011+A1:2012 and EN 1555-3:2010+A1:2012. Manufacturing method by injection in PE100 molds, with the electrofusion fitting resistance embedded in the material with dimensions corresponding to SDR 11 (ISO S8), according to EN 12201-3:2011+A1:2012 and EN 1555-3:2010+A1:2012. Welding voltage 40 V. 4 mm connectors. Welding indicators with limited displacement. Detachable central stop. Welding is performed by authorized welders with appropriate equipment and in compliance with the welding procedure.