a sectional housing containing an enclosed filter chamber and including a cover member and a base member each having an outer surface and {TAIL ~ a planar inner surface}, each of said planar inner surfaces containing a plurality of circular, concentrically spaced grooves and a radial groove defining a passage affording communication between said circular grooves, respectively, said cover member containing an inlet opening communicating with {HEAD ~ said cover member radial groove} and said base member containing an outlet opening communicating with said base member radial groove 
a sectional housing containing an enclosed filter chamber and including a cover member and a base member each having an outer surface and { TAIL ~ a planar inner surface } , each of said planar inner surfaces containing a plurality of circular , concentrically spaced grooves and a radial groove defining a passage affording communication between said circular grooves , respectively , said cover member containing an inlet opening communicating with { HEAD ~ said cover member radial groove } and said base member containing an outlet opening communicating with said base member radial groove
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