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Replacement Part Number: A20212 / A-20212. Perfect Fit: These O-rings are compatible with Fluval FX4, FX5, and FX6 aquarium canister filters, ensuring a tight fit for your filter¡¯s top cover. Durable Seal: Made from nitrile rubber, these O-rings provide a strong, secure seal that prevents leaks and ensures proper functioning of your aquarium filter. Prevents Leaks: The O-ring seals prevent water leakage, maintaining optimal pressure and preventing messy water spills, improving filter efficiency. Prevents Leaks: The O-ring seals prevent water leakage, maintaining optimal pressure and preventing messy water spills, improving filter efficiency.