Used 4000 gallon 316L Stainless Steel Agitated Pressure Vessel. Mfg Superior Welding. Shell rated 45PSI@150F. (4) Lug mounted. Dished bottom and top. 9'D x 8'L. 2 HP Chemineer agitator. (4) internal Baffles. Past use Tempered water. National Board rated.