Used 50 sq.ft. Heat Exchanger, Stainless Steel Tube Side Heat Exchanger, (48) - 1 " O.D. x 4' long stainless steel tubes, sheets and heads, 10" dia carbon steel shell, single pass tube side, single pass shell side, rated 75 PSI/ Full Vacuum @ 320 F tube side, 75 PSI @ 320 F shell side, Model FTSX-10, Mfg. Perry, ASME & NB Code Stamped.