Introducing the "Cuba Siempre - Llena 350 litros", an innovative system with an adjustable lid that adapts to any wine capacity, preventing contact with air when the tank is not completely full. This tank is ideal for the fermentation and storage of wines and other food liquids, such as cider, spirits, brandy, honey, and water, among others. The product includes a stainless steel ball valve for the outlet of clear liquids, another stainless steel ball valve for the outlet of sediments, an always-full lid with chamber and piston, an airlock valve, and three legs. Its measurements are as follows: a diameter of 640 mm, a body height of 900 mm, and a total height of 1300 mm. The appearance of metal tanks was a milestone in enology at that time, as they significantly improved hygienic conditions, especially in microbiological terms. These tanks are completely inert, airtight, and easy to clean, disinfect, and move if necessary. This completely changed the enological conception of the time. In addition, these tanks allow temperature control, either through evaporation or through external coils or jackets. The advantages of this product are numerous: they are unalterable and harmless, have almost perfect tightness, are easy to clean and disinfect, have good thermal exchange capacity, and can be adapted to temperature control systems such as jackets or coils. They require no maintenance and have an almost unlimited lifespan. Furthermore, they can withstand a wide range of pressures and can be manufactured in different volumes and models, giving them great versatility. In summary, the "Cuba Siempre - Llena 350 litros" is a tank made of stainless steel 304 (with the possibility of manufacturing in stainless steel 316). This model is made to order, with a manufacturing time of 15-20 days.`