| http://www.w3.org/ns/prov#value | - The bottom surface 66 of the lower housing 42 includes a plurality of downwardly extending stepped legs, such as 65 a and 65 b, which are engaged with ring notches, such as 67 a, 67 b and 67 c of the filter retaining ring (see FIG. 17), so as to mechanically secure and lock by a press fit the filter assembly to the lower housing.
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