Used Doyle & Roth Model VT1061-3VE 50 square foot vertical heat exchanger. Hastelloy C276 tubes rated full vacuum/150 PSI @ 347 Deg. F. 316L stainless steel shell rated 150 PSI/full vacuum @ 347 Deg. F. Lug Mounted. Built 2000. S/N J9290-9, NB 19066.