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This is the Culligan OR-100 replacement O-Ring that fits the Culligan HD-950 Housing. Replacing your O-Ring on a regular basis will help decrease the likelihood of leaks and maintenance issues long term.Fits Culligan brand and Ametek model No. HD-950 (Ace #49561),Made of Buna-N (Nitrile butadiene rubber),Replace with every third filter change,Replace O-ring every third filter change to prevent leaks.