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The 3M 45-601 wrench fits the following water filter housings:
The 3M CUNO Slim Line Housing Wrench 45-601 is used to loosen the bottom of your Slim Line housing when replacing cartridges. This 45-601 wrench should be slid over the housing until it fits snugly, then the housing should be unscrewed. The CUNO 45-601 wrench SHOULD NOT be used to tighten the housing, as cracking may occur. The housing should only be tightened using hand pressure.
The 3M 45-601 specifications: