Used 25 sq ft Tantalum shell and tube heat exchanger. Manufactured by Pfaudler. Model 08-060-E. (26) .75"OD Tantalum tubes MAWP 100PSI/FV@350F. CS Shell rated MAWP 100PSI/FV@350F. (2) Saddle mounted. National Board #51728. Serial #J068493. Built 2006.