Chem-Tainer TC2218AA 28 gal 22" x 18" Open Top Chemical Tank AA Series - This is a one piece molded heavy walled open top tank designed to withstand rugged service. It is ideal for handling acids and caustics. The open top tank design allows for convenient mixing and filling. Resin complies with U.S. Food and Drug Administration regulation 21 CFR 177.1520 (c) 3.1 and 3.2.