EF Reduction: It allows the joining of pipes or fittings of different diameters and the reduction of pipelines to smaller diameters as required. In this way, pipes of different diameters can be used in the same system and can be arranged in accordance with the needs of the system. Current is applied to the resistance wires inside the EF Reduction with the electrofusion welding method. This current heats the resistance wire and thus the pipe and the reduction part fuse together. It is suitable for natural gas and water lines.