Fluval FX4/FX5/FX6 Aquarium External Canister Filter Lid Sealing O-Ring This is the Fluval Filter Lid O-Ring suitable for the Fluval FX4, FX5 and Fluval FX6 External Filters. The Fluval FX4/FX5/FX6 Filter Lid O-Ring is suitable for: Fluval FX4 External Filter Fluval FX5 External Filter Fluval FX6 External Filter.
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