Midwest Tank Co. is not limited to building round tanks. The rectangular tank you see in this picture is undergoing a hydro-test. We test every tank prior to shipping to guarantee a quality tank. This tank was design with internal structures to keep the wall of the vessel from excessive deflection. The inside of this vessel has an internal screen to keep debris from entering the pumps and causing a shutdown of the system. The tank is made of 304L stainless. The exterior has a mill finish.