Used Doyle & Roth VT861-3VE Vertical 20 square foot heat exchanger. Hastelloy C276 tubes rated 150 PSI/full vacuum @ 347 Deg. F. 316L Stainless steel shell rated 150 PSI/full vacuum @ 347 Deg. F. Lug Mounted. Built 2000. S/N J9290-2, NB 19045. Estimated Weight 328#.