Abstract: A liquid dispenser is provided which includes a housing for retaining a quantity of a dispensing liquid. A base tray in association with a lower face of the housing defines a chamber for installation of a sensor and a valve controller. The valve controller which is responsive to the sensor includes a cylinder for transferring liquid from the housing to an external part of the housing. The cylinder is formed with a plurality of horizontal panels as well as a branch sleeve functionally connected to the sensor and a vertically located hollow sleeve-like movable plug having a circumferential flange on a central face with a downwardly extending protrusion formed on a lower portion within the cylinder. The movable plug is connectable to a rubber plug having a vent.