Conca dell’Incoronata was part of a more complex system of water ways that served Milan and that was object of study by Leonardo da Vinci who brought improvements to it: the wooden doors, subject of the intervention, are in fact identical to those visible nowadays in the Atlantic Code. With the burial of the canals in the 1930s the Conca lost its function and fell into disuse, while preserving the locks system made of four wooden doors, respectively put two above and two down. The conditions of the area and of the whole system testified a state of abandonment prolonged on the time: therefore it was necessary to value with the utmost care the total state of conservation of the wooden elements to organise safely the various stages of the interventions of removal and transportation. The restoration works have been realised in laboratory starting from a preliminary cleaning intervention and disinfection and continuing with the replacement of the unrecoverable rotting wooden parts. The wooden surfaces were later subjected to subsequent treatments either of cleaning or of prevention to delay possible biological attacks completed by a light painting with open pore, to facilitate future manutentive operations.