The Lifegard Aquatics Quartz Sleeve Gasket for all QL-Series UV Sterilizers and AquaStep Pro UV Sterilizers. The Gasket should be replaced every year (to prevent leaks). Lifegard Aquatics also recommends you replace the Protective Sleeve (QL Series only) and Lamp every year. See the Lifegard Aquatics UV Sterilizer Replacement Parts section to find the correct Lamp and Protective Sleeve for your QL Series or AquaStep UV Sterilizer.