<p>A mechanical valve acts according to the foot pressure and placed under the user's foot it consists of two rooms: a lower one having a water-entry opening (i) and an upper one connected to the water-exit opening (ii) and between them an opening controlled to let or prevent the water using a vertical crank (3) of a valve (4) coming from an opening in the middle of the main valve with a pedal (5) fixed at its end to press the valve (4) to be opened. The crank (3) is always fixed up by spiral spring (6) above the valve below the pedal (5) to be fixed and not to allow the water flows until we press the pedal.</p>