Check the listing for details. OK25 O-Rings for OmniFilter OB1,WH5,U25 Water Filter Housings (2 Sets, 8pcs). Condition: New. Listed at 12.59 USD. OK25 O-Rings for OmniFilter OB1,WH5,U25 Water Filter Housings (2 Sets, 8pcs) Product Features: (2 Sets) OmniFilter OK25 Replacement O-Ring Gasket Seals (Includes 4 sizes, 2 of each) Compatible with OmniFilter OB1, WH5, and U25 water filter housings. Different submodels/revisions of each of these models take differnet o-rings, and the OK25 kit contains all of the different sizes to ensure you have the right o-ring size needed for your OB1, WH5, or U25 housing. Quickly fix or prevent a leak in your water filter unit by replacing your filter housing o-ring with every third filter change 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! The OK25 o-ring seals between your filter housing and filter head/cap on OmniFilter OB1, WH5, and U25 water filter housings. The OK25 o-ring kit contains four different o-ring sizes. This convenient 2 set package contains 2 of each size, for 8 o-rings total. What to expect: This item includes eight (8) 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.