a filter head , designed to hold at least two filter elements . the filter head having a housing , into which feed channels to , and return channels from , the filter elements are integrated . a rotatable switching drum is provided for selectively opening or closing the channels to control the flow of fluid to the filter elements . the filter head has a cover , which closes off the housing , and a spring element , which produces an axial force which presses one of the sealing surfaces of the switching drum against the cover and the other sealing surface of the switching drum against the housing .