STEEL TRANSITION WELDED: It is a connection element used to provide the transition between polyethylene (PE) plastic pipes and metal pipes by welding the steel part to the metal part in the system with a suitable metal welding method. It is generally used to provide the transition between steel pipes and pipes made of other materials (e.g. cast iron, stainless steel). The plastic part is welded to the plastic part of the pipeline by butt welding or using a suitable EF additional piece. It is suitable for natural gas and water lines.