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...

An air filter housing (12) includes twist and lock structure (42) having a first position permitting axial movement (66) of a cover (34) and base (36) relative to each other, and being rotatable in a first rotational direction (44) from the first position ...

A full flow fluid filter 300, Fig. 15 has a housing 302 extending axially along an axis 304, and a pleated filter element 318 having a plurality of pleats in a closed loop annulus having an outer perimeter 320 defined by a plurality of outer pleat tips, an...

A filter element (202, 250) includes pleated filter media (26) having a plurality of pleats (28) in a closed annular loop having an outer perimeter (30) defined by a plurality of outer pleat tips (32), an inner perimeter (34) defined by a plurality of inne...