Abstract: A water box is provided for collecting run-off water which flows between a motor vehicle windscreen and an engine bonnet into a body space. A component has a water guide channel which carries away water along the windscreen lower edge, a forward set water box, under which is located a filter element, connecting with at least the central section of the component. The water box has an attachment section to the component with the water guide channel and may be moved in this attachment section from its connected position on the component so that it frees a path for exchanging the filter element.