I think Big Blue filter housings may vary slightly from seller to seller. Mine has four sets of protruding ribs running down the sides, and those four sets are actually three ribs that are close together. Thus, this key captures some but not all of the edges and sits on others. It will work, but I may end up filing or grinding some small lugs on the wrench that are designed to grab the ribs so it slides further etc. It seems strong enough to last a long time.
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