Penguin Powerheads from Marineland Penguin powerheads from Marineland are durable, fully submersible pumps; the attachable reverse flow feature speaks to the original intent of this pump's design, which was to power undergravel filters. Since their release however, Penguin powerheads have become one of the top reliable brands on the market. Output flow can be easily adjusted a full 180 degrees. Not suitable for use with wavemakers. Parts available.
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