Perma-Pipe International Holdings (formerly known as MFRI) is a company that engineers, designs, manufactures, and sells specialty piping and leak detection systems. It offers insulated and jacketed district heating and cooling (DHC) piping systems for energy distribution, primary and secondary containment piping systems for transporting chemicals, hazardous fluids, and petroleum products, coating and insulation of oil and gas gathering and transmission pipelines, and liquid and powder-based anti-corrosion coatings.