A visual navigation device includes a reel mounted within a reel housing; a flexible tape wound on the reel and adapted to be payed out of the housing and into an area to be navigated, a distal end of the flexible tape incorporating a video camera; and a video monitor, operatively connected to the video camera, supported in the reel housing. The light condensing film has a plurality of prism peaks, each having a triangular cross section inclined surface which is inclined from a top surface of the light-condensing film at an angle of about 20\xb0 to about 40\xb0. At least one so-called single point of failure in the form of a monitoring process has been removed. The devices include several electrically or mechanically controlled embodiments and produce both controlled and localized flow with defined volume exchange ratios for fluid management. A first one-way umbrella valve mounted to the valve body that is responsive to predetermined positive pressure in the main flow passage to control flow of fluid from a vapor canister to ambient air as well as a second one-way umbrella valve that is responsive to a predetermined negative pressure in the main flow passage to control the flow of ambient air through an air filter assembly.