A fluid filtering apparatus and method may include keyed components to ensure that a correct filter element is being installed into a filter base. Keyed arrangements may occur between a filter element and a filter housing, a filter and a filter base, and a...

A filter (10) has a housing (12) extending along an axis (18) between first and second axial ends (20 and 22), and has a closed loop primary filter element (24) extending axially in the housing, and a closed loop safety filter element (48) in the hollow in...

The filter device has a filter insert (32) with a return line (44) to the fuel tank controlled by a valve device with a pressurized membrane (58) A rod (60) connected to the membrane passes through an aperture (35) in the filter unit. Its end region is in ...