Prism TuboTech Pvt. Ltd is a leading manufacturer, distributor, and stockist of stainless steel heat exchanger tubes. Single tubes that are installed inside an outer shell tube make up heat exchanger tubes. The Stainless Steel Heat Exchanger Tube is one of the most commonly used U-shaped tubes. The Stainless Steel U Tube is made out of a single tube that has been bent to avoid welding connections that would cause the tube to turn the wrong way.