Used 12" x 31' (316L) Stainless Steel Distillation column. Bottom section is 12" dia. x 51" lgth. Middle (2) Sections total 6" dia.x 23' lgth. x top section 12" dia. x 48" lgth. Unit mounted on skirt. Unit has Stainless Steel Packing. Mfg by Tubetec, S/N: 11498.