Abstract: A water filter cartridge comprises a main body comprising a centered major axis, an attachment end, an outer surface, and a cap end. An inlet boss, a locating lug, and a core cutout are offset on the attachment end from the centered major axis. The outer surface comprises a first front pair of positioning features configured as L-shaped flanges. A second front pair of positioning features are configured as guide blocks and are axially aligned with the first front pair of positioning features. A core assembly is inserted through the main body and comprises a filter core configured to direct filtered water towards an outlet boss. An end cap is connected to the cap end. Optionally, the end cap comprises a third front positioning feature configured as an L-shaped flange. The third front positioning feature is axially aligned with the second pair of front positioning features.