A filter apparatus for use in filtering a fluid is provided. The filter apparatus has a plug-in, quick-connect cartridge. The filter apparatus has walls forming a first chamber and a second chamber. The filter apparatus also has a diaphragm having a first surface and having a second surface for separating...http://www.google.es/patents/US5167814?utm_source=gb-gplus-sharePatente US5167814 - Filter apparatus snap lock cartridge retainer
