562 sq ft Atlas shell and tube heat exchanger, Hastelloy C 276 tubes, tube sheets, bonnets and shell with (144) .75" diameter x 20' long tubes rated 150 PSI and full vacuum @ 400 F, shell rated 150 PSI and full vacuum@ 400 F, 4 pass design, 3" tubes inlet/outlet, 4" shell inlet/outlet, 14" diameter x 20' long tube bundle, serial# 11259, national board# 9675, new 2003. (Qty. 3)