STEEL TRANSITION EXTERNAL THREAD: It is a connection element with teeth on the outer part of the steel part used to provide the transition between polyethylene (PE) plastic pipes and metal pipes. Steel is a metal frequently used in such connection parts due to its high durability, strength and resistance to corrosion. The teeth on the inner part are designed to provide sealing and strengthen the connection. There are many types of steel transition external gears produced in accordance with different pipe diameters and thread sizes. In this way, it is possible to find a suitable option for every type of connection needed in different projects. 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.