Trunk-conical tanks for automatic warehouses, suitables for storage of solids or powders, equipped with vertical parallelepiped shape with a rectangular section and trunk-pyramidal base, on the top there is a load manhole with threaded lid with vent, also equipped with diaphragm valve with alluminium couple flange halves for unloading of product contained. Are supplied with metallic frame palletized and stackable with finish on request.