Rounded-bottom fiberglass tanks for the storage of liquid products. This tank has been mounted on ascending saddles and is ideal for storing oily and viscous liquids that are difficult to extract. The tank is manufactured using winding manufacturing process, guaranteeing strength, compactness and durability. The level strip on the tank body makes it easy to monitor the level of the stored product. In addition, the tank is equipped with an bagging of shute up and a free exhaust in hot-dip galvanised steel.