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Before replacing the o-ring, refer to the bottom of the sticker on of your Culligan filter housing. Two different o-ring sizes are enclosed: Sticker plates coded "Rev C" or higher, for models HF-150A, HF-360A, and Ace 45025 housings should use the smaller o-ring enclosed. Sticker plates coded "Rev A" or "Rev B" for models HF-150A and ALL other models (HF-160, HF-360, HF-365, Ace 45025, Ace 46764, Ace 49560) should use the larger o-ring enclosed. Note: The o-ring labels seen in the picture are just for representation. The o-rings can be identified by their size difference in the package using the instructions above to determine the correct size for your filter. The o-ring installation process is incredibly easy. To install the o-ring, remove the old o-ring and clean out the groove with a clean cloth. Lubricate the new o-ring with clean/new silicone grease. Press the o-ring into groove with two fingers, ensuring that it sits flat and level in the groove. What to expect: This item includes two (2) larger o-rings and two (2) smaller o-rings [4 o-rings total] 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.