The tubs are constructions that have very similar characteristics. Its exterior plan can be quadrangular or circular, but the interior structure is basically the same. The lower part of it is made with stone and mortar. The interior is usually circular, and is covered with varnished ceramic pieces. Then, as an extension of the tub, some dry stone walls were built that gave its square or circular outer structure, where an opening was built. The roof is usually formed by a conical vault of dry stone covered with earth to make it waterproof. The vat usually has an upper access from where the must was poured once pressed, and at the bottom were the spouts through which it was emptied. Sometimes they have an attached hut that closes the access to the tub from the bottom and can also be used to store tools. In the area of Sant Joan de Vilatorrada and Sant Martí de Torruella some tubs are preserved as isolated architectural elements, in some cases it is simply the tub without any other element in the middle of a field. On other occasions it is a group of tubs (three or four) to which a hut has been added at the foot of each tub.