MasTec - - Responsibilities: Plan sequence of installation to avoid obstructions and activities of other construction workers; Assemble and install a variety of metal and nonmetal pipe and pipe fittings, including: brass, copper, lead, glass and plastic; Test piping system for leaks by increasing pressure in pipes and observing gauges attached to pipes for indication of leaks; Weld holding fixtures to structural steel members; Other duties as assigned by Foreman or Superintendent