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The 3M 41-232237 is the correct replacement O-ring for the following water filter housings:
The 3M CUNO Water Factory O-Ring 41-232237 seals the housing sump to housing cap to prevent leaks. This Cuno 41-232237 O-ring should be well lubricated with silicone lubricant to further prevent leaks.
The 3M 41-232237 specifications: