Supreme Electrofusion fittings and transition fititngs for connecting elements of polyethylene pipes and for the distribution of gas and water, Supreme electrofusion fittings have an inner metallic thread that, thanks to the passage of electricity, generates the heat requested for the fusion of the polyethylene in the inner surface of the fitting and the outer surface of the pipe, thus allowing the welding between the two elements. This operation takes place through welding machines, powered by specific generators connected to the fitting through cables inside the specific pins. The installation instructions can be read automatically by the device trough the barcode reported on every single fitting. Each Supreme Electrofusion machine like Suprema 160 Suprema 400 and Suprema universal has included the bar code scanner