Unused 2404 Sq Ft 316L stainless Steel Shell and Tube Hairpin Heat Exchanger. Manufactured by Heat Exchanger Design Inc. (230) 316L .75" U-tubes rated 168PSI@353F. Carbon Steel Shell rated 218PSI@353F. Serial #4565A2. National Board #4314. Built 2017. Past use: Diluent recovery/Glycol Exchanger.