<p>The tap is turned on and off using a lever (4) pivotably mounted in the fitting casing (1) and joined at one end to a valve member (20) for a switch valve (2), this member being positioned upstream from the tap nozzle (51). A region (40) of the lever outside the fitting casing acts as the handle, the cross-section dimensions of the casing and handle being chosen to allow them to be grasped by one hand.</p>
