Watertight tank concrete C28/35, capacity of 2,100 liters complete flexible seals in SBR (Styrene Butadiene Rubber) to seal 0.5 bar, able to absorb small adjustments of the soil. The system is constructed with materials resistant and suitable for use in an environment of rainwater. The plant is equipped with hooks tested "disposable" for the handling and laying, and 25 kg of cement glue suitable for laying slab and manhole. In case of necessity technique, the system is eventually supplied in individual elements of maximum weight each 700 kg. On request we are able to provide the system with piping INPUT-OUTPUT angle varied.