Fluval FX5/FX6 Filter AquaStop Filter Valve - A20216 This is the Fluval Filter AquaStop Valve suitable for the Fluval FX2, FX4, FX5 and Fluval FX6 External Filters. The Fluval FX2/FX4/FX5/FX6 Filter AquaStop Valve is suitable for: Fluval FX2 External Filter Fluval FX4 External Filter Fluval FX5 External Filter Fluval FX6 External Filter.
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