Check the listing for details. OR-100 O-Ring for Culligan HD-950/HD-950A, Simpure DB10P/DB20P Filter (3 Pack). Condition: New. Listed at 12.99 USD. OR-100 O-Ring for Culligan HD-950/HD-950A, Simpure DB10P/DB20P Filter (3 Pack) Product Features: Part: Replacement Culligan OR-100 O-Ring (3 Pack) Compatible with Big Blue Filter Housings, including Culligan HD-950 and Simpure DB10P, DB20P (Does not fit DB10, DB20, or DB10C) Contains 3 O-Rings (also called gaskets or seals) Molded from NSF 61 certified buna-n rubber for safe and clean drinking water. Manufactured and warrantied by Captain O-Ring LLC. Proudly assembled in the USA! This Culligan OR-100 O-Ring (3 Pack) is compatible with Big Blue Filter Housings, including the Culligan HD-950. It has a diameter of 5-3/4 inches and is made of nitrile butadiene rubber (Buna-N) for flexibility and resistance to abrasion and tearing. 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.