Zodiac R0502500 O-Ring Replacement Kit for Zodiac Nature2 Water Sanitizers O-Ring replacement kit Fits Zodiac Nature2 soft water sanitizer models FSOFT700, FSOFT1400 Also fits Zodiac Nature2 Fusion inground water sanitizer model FUSION This kit large collar O-ring, small collar O-ring, unions and port plug O-ring, feeder shaft O-ring and drain plug O-ring