Used 19 sq.ft. horizontal shell & u-tube type heat exchanger, Mfg. by Doyle & Roth. 304L stainless steel rated for 100 psi @ 350 Deg. F., 6.6" O.D., 316L stainless steel tubes rated for 150 psi @ 350 Deg. F. Serial #J6475-1, National Board #15289, Year Built: 1991, Previous Service: Chiller Filtrate Tank - Multi-purpose, Estimated Weight: 285#