Used 12,000 gallon vertical stainless steel tank. This tank has a dome top and a sloped bottom. The tank diameter is 144", the overall height is 174", the dome top is 20", and the straight side height is 168". The top has a 22” manway and (3) 3" flanges. The side has 20" manway and (3) 3" flanges. The overall dimensions are 156" diameter x 174" tall.