All the products in the range are made of rotomoulded linear polyethylene. These are horizontal cylindrical containers that can be buried, definable exclusively for underground use, provided with transverse and longitudinal ribs, made to increase resistance to stresses generated by the surrounding backfill soil. They are equipped with a circular screw inspection cover and flat pockets for positioning any connections; they can also be connected in series to add up the overall storage capacity. The entire range concerns exclusively containers/reserves or tanks with large capacity and specifically designed for the function that can be equipped according to the wishes and needs of the user and the operator. These are hollow products designed to contain liquids and in particular water so that it is available for the action of one or more electric transfer pumps to the desired user. Each artifact/container/tank can be made available with a series of arrangements such as manifold inlet, pressurized piping outlet, accommodation for regulation and control instruments, devices for machine extraction. Each station can be equipped with various devices/equipment with different mechanical or hydraulic characteristics and used for the transfer of charged liquids such as drainage water, waste water or clear water or water.