41 etc are housed as well as the washer 39 s cover or lid 29 through which the items to be washed shall be loaded as can be seen in fig3 4 the tub 39 s bottom 11 which is crafted in its center by a truncated cone 49 which allows the liquid or washing mixture to slide to a lower area aided by the force of gravity this lower zone is formed by a ring 50 having an inclined surface relative to a horizontal plane example inclination may be represented by the angle u03b2 shown in fig4 and whose lowest point coincides with the entrance to the trough 46 wherein the liquid or washing mixture is collected to be extracted by a pump 15 whether it be for drainage or whether the liquid or washing mixture be transported to the spraying system fig5 shows the tub 39 s lower side 11 and it is here that the series of reinforced ribs which have been implemented can be seen it should be highlighted that a series of diametrical ribs 53 have been traced in cross shape that is to say they emerge from the sides of the ears 35 as can be seen in fig6 and cross diametrically at the opposite ear 35 discontinuing the ribs as they pass through the center the remaining being the radial ribs 52 in a preferred embodiment to the present invention another set of diametric ribs 53 emanate from the tub 39.