The system of wall hydrants consists of a cassette with sealed door with breakable or unbreakable plate containing a fire hose, a lance with standard threaded connection and the tap of attack. Hydrants construction are those commonly seen in parking lots, hotels, condominiums or outside in industrial areas. They have greater access than similar accommodated underground. They are placed around the perimeter of the building, at a variable distance depending on its height and in function of their range of action. Of red color, they are equipped with anti-freeze drain adapted to discharge the water column.