Abstract: The present disclosure is directed to a gasketless connecting filter adapter (20, 40) for airtight joining of a first filter (23) to a second filter (33). The invention includes a flexible cover element (42) being adapted to seal at a first face surface (41) thereof over the face of a first filter (23), and including a second face surface (55) having a recessed central aperture (59) therein. Disposed in the central aperture (59) are connection apparatus for mating with and securing thereto the second filter such that air passes through the second filter (23) into the first filter (33). The second face surface (55) further includes an integral and axially extending resilient lip seal (39) being adapted to sealingly engage the second cartridge (33). The present invention may be of one or preferably two piece molded construction, of particular cross section.