A filter assembly comprising: a header defining inward and outward fluid flow paths and including a skirt surrounding an upper inside surface of said header, said upper inside surface including at least one first code structure (24, 26); a bowl configured to releasably mate with said header to define a sealed interior space in communication with said inward and outward fluid flow paths, said bowl including an upper rim having at least one second code structure; and a filter element comprising: filter media at least partially surrounding a longitudinal axis and extending between first and second ends; a first end cap disposed adjacent the first end of said filter media, said first end cap defining a fluid flow aperture in communication with one of said inward or outward fluid flow paths and including at least one radially projecting first indexing structure configured to define a single installed orientation with respect to the bowl; and a second end cap disposed adjacent the second end of said filter media, said second end cap including a second indexing structure configured to define a single installed orientation with respect to the bowl and configured to mate with a complementary third code structure on the inside of said bowl, wherein a single of said at least one radially projecting first indexing structure mates with one of said first code structure and one of said second code structure to define an installed orientation of said filter element with respect to both said bowl and said header, wherein said first and second end caps are each configured to mate with the bowl so that both end caps (38, 56) are maintained in a predetermined orientation with respect to each other. a header defining inward and outward fluid flow paths and including a skirt surrounding an upper inside surface of said header, said upper inside surface including at least one first code structure (24, 26); a bowl configured to releasably mate with said header to define a sealed interior space in communication with said inward and outward fluid flow paths, said bowl including an upper rim having at least one second code structure; and a filter element comprising: filter media at least partially surrounding a longitudinal axis and extending between first and second ends; a first end cap disposed adjacent the first end of said filter media, said first end cap defining a fluid flow aperture in communication with one of said inward or outward fluid flow paths and including at least one radially projecting first indexing structure configured to define a single installed orientation with respect to the bowl; and filter media at least partially surrounding a longitudinal axis and extending between first and second ends; a first end cap disposed adjacent the first end of said filter media, said first end cap defining a fluid flow aperture in communication with one of said inward or outward fluid flow paths and including at least one radially projecting first indexing structure configured to define a single installed orientation with respect to the bowl; and a second end cap disposed adjacent the second end of said filter media, said second end cap including a second indexing structure configured to define a single installed orientation with respect to the bowl and configured to mate with a complementary third code structure on the inside of said bowl,