Used 18" diameter Entex Column, 304L stainless steel construction, 18" diameter first stage x 36" second stage x 26' overall straight side, elliptical top and bottom, rated 166 PSI and full vacuum @ 400 degrees F, sectional design with 18" diameter x 28" straight side top, 18" diameter x 11'9" middle section, 36" diameter x 11' bottom section, mounted on stainless steel skirt, 18" side bottom manway, 6", (2) 1.5" top nozzles, (2) 8", (2) 4", (5) 2", (10) 1.5" process nozzles, 5/16" thick heads, 1/4" to 3/8" thick shell, 30' OAL, Serial No. 3493A, National Board No. 867, new 1999 and never installed.