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Operation Manual External Aquarium Filter HW-302–304, 402B–404B, 403A, 404A 50192–50197, 50358, 50359 Illustration similar, may vary depending on model Read and follow the operating instructions and safety information before using for the first time. Technical changes reserved! Due to further developments, illustrations, functioning steps, and technical data can differ insignificantly. Updating the documentation If you have suggestions for improvement or have found any irregularities, please contact us.