【Package Contents】A-20210 Top Cover Seal (1), A-20207 Motor Seal (2), A-20212 Snap-On Top Cover O-Ring (4). This set can also be used as compatible with Fluval FX6 filter replacement parts and FX6 filter parts for routine maintenance, working as an fx6 o ring kit and as compatible with fluval fx5 o rings for regular gasket replacement 【Application Connection】The O-ring seal kit is used at connection points between the motor housing, pump head, and canister body. Suitable for replacing seals in FX5 and FX6 high-performance filter units (A218, A219), including filloman fx6 replacement parts applications. Note: Not compatible with FX4. Please check your model before purchasing 【Sealing Performance】Replacing this O-ring helps restore the normal operation of your aquarium system, enhances sealing effectiveness, and reduces leakage caused by aging or wear, contributing to smoother and more reliable system performance in fluval parts fx6 setups 【Material & Durability】This O-ring is made of high-quality rubber with strong durability. It resists wear and corrosion and is less prone to aging or oxidation, making it ideal for fluval fx6 filter replacement parts and also compatible as a fluval fx5 replacement o ring for long-term use 【Tool Requirements】No special tools are needed for installation. Simply remove the dust cup filter, take out the old gasket, replace it with a new one, and tighten the dust cup filter cover to restore proper function and stop any leakage in fx6 filter parts O-Ring Seal Kit Replacement for Fluval Replace old, worn, leaking motor seal o-rings. It is recommended to replace the motor seals annually. If not replaced, the rubber seals will deteriorate over time and cause cartridge leaks. Clean and lubricate the gasket every three months. Moisten the seals with water before replacing.