Abstract: A filtration assembly particularly for filtering fluid media such as compressed air is formed with a housing defining a fluid inlet and a fluid outlet and with a filter unit arranged within said housing to have the fluid media to be filtered flow therethrough. The filter unit is formed of a plurality of interchangeable filter elements joined together to form the filter unit by connecting devices including a head cover and a bottom cover arranged between juxtaposed ends of adjacent filter elements to mount said filter elements together in fluid tight relationship. The head cover is formed of a recess into which the bottom cover extends with a sealing ring being arranged in said recess in fluid tight engagement between the head cover and the bottom cover.