Electric welding and soldering units, namely, for copper pipes, butt fusion machines for pipe welding, electrofitting welders, universal gas pipe test units with operating pressure or operated with hand pump, pipe plugs conical and cylindrical shape for pipe; welding transformers, welding extruders, welding electrodes; flue gas analyzer pipe inspection equipment, namely, pressure gauges and pressure testing apparatus, leak testing apparatus and testing pumps, electronic pipe blocking devices,...