Patent ID: 7850756

Claim:
A filter housing extending along a given axis comprising first and second mating housing sections, one of said housing sections being a base extending axially between distally opposite axial ends, the other of said housing sections being a cover mounted to one of said axial ends of said base by twist and lock structure providing an axial retention force holding said base and cover in axial assembled condition upon axial movement of said base and cover towards each other followed by rotation in a first rotational direction about said axis, said twist and lock structure having a first position permitting axial movement of said base and cover relative to each other, said twist and lock structure being rotatable in said first rotational direction from said first position to a second position, said twist and lock structure in said second position preventing axial movement of said base and cover relative to each other, said twist and lock structure being rotatable in a second rotational direction from said second position to said first position, said second rotational direction being opposite to said first rotational direction, anti-rotation lock structure comprising an arm having an anchor portion mounted to said first housing section, said arm having a hook portion engageable with said second housing section and applying a retention force stopping rotation of said twist and lock structure from said second position to said first position, said hook portion being normally releasable from engagement with said second housing section upon applying a first release force to said arm, said anchor portion being releasably mounted to said first housing section and wherein said anchor portion is mounted to said first housing section at a break-away mount releasing said anchor portion from said first housing section in response to a second release force greater than said first release force, such that said arm separates from said first housing section without breaking said arm if a) excessive force higher than normal is required to release said hook portion from said second housing section, or b) excessive force is continued to be applied to said arm even after release of said hook portion from said second housing section, such that said housing may be re-assembled using the same said first and second housing sections with said arm re-mounted to said first housing section at said break-away mount, without having to use a new first housing section to replace an old first housing section otherwise having a non-re-mountable broken-off arm.