Perma-Pipe International Holdings, Inc., formerly MFRI, Inc., is engaged in the manufacture and sale of piping systems. The Company is engaged in offering pre-insulated piping and leak detection systems for oil and gas gathering, district heating and cooling, and other applications. It operates through Piping Systems segment. The Company develops piping solutions for the transportation of a range of liquids. The Company has operations at seven locations in five countries. The Piping Systems segment engineers, designs, manufactures and sells specialty piping and leak detection and location systems. The Company's specialty piping systems include industrial and secondary containment piping systems for transporting chemicals, hazardous fluids and petroleum products; insulated and jacketed district heating and cooling piping systems for energy distribution to multiple locations from central energy plants, and oil and gas gathering flow and long lines for oil and mineral transportation.