The piping to be replaced is 100 millimetres in diameter in a total of approximately 12 meters. Currently the piping is of cast iron and has to be replaced by PVC pipe packing with the existing of the same material. To be able to carry out this work must be carried out disarming the existing sheet duct, through which electrical cables located in the Office of the Registry of Records and drilling the concrete slab from Legal Citizenship to the Registry of Records.