20" ID x 22'TT. 316L stainless steel packed type column. Rated 75 psi @ 300 deg. C. Mfg. by Alabama Heat Exchanger. Packing type ACS style X-100, packing material 316 stainless steel. Packing height 16 ft. Serial #AHE715, National Board #396, Year Built: 2001, weight 6,000#.