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The Culligan OR-150 is commonly used with filter model number Wh-S200-C. These o-rings are made of nitrile butadiene rubber (Buna-N) which offer superior flexibility and resistance to tearing during installation and long-term use. The OR-150 o-ring measures approximately 3-3/4" (3.75") Inside Diameter x 0.14" Thickness (just over 1/8"). What to expect: This item includes three (3) o-rings in a resealable zip-top poly bag with "Captain O-Ring" branded packaging. Manufactured and warrantied against defect for one year by Captain O-Ring LLC. "Captain O-Ring" is a registered trademark of Captain O-Ring LLC.