Under gravel filters perform best when water flow through the gravel bed is consistent and predictable, creating surface agitation for tank oxygenation. Air pumps and airstones can deteriorate or clog. As a result, they become noisy and ineffective...frequently requiring replacement and/or service. Penguin Power Heads deliver constant flow with fully adjustable aeration and increased surface agitation...and they remain silent at all times. The custom air valve regulates air flow, the air filter eliminates noise and dust, and the intake strainer keeps debris from fouling the impeller...that's efficiency. And...Penguin Power Heads are absolutely safe in both fresh and saltwater. For Turtle or Amphibian Tanks... The Penguin Power Sponge Prefilter - complete with flow diffuser - has the capacity to handle the heavy waste loads associated with turtle and amphibian habitats. Compact and performance-tested, it delivers constant, powerful water flow at an unmatched rate of 170 GPH. It can be used to create unique waterfall effects (tubing not included)...and it's perfect as a reverse flow power head for super-efficient undergravel filtration. Features: * Worry-Free, Safety Engineering - U/L listed, CSA available. Epoxy-sealed, moisture-proof motor and electrical components ensure safe operation. * Unique Mounting System - Adjusts to any demand. Bracket and suction cups expand mounting options. * Adjustable Flow Diffuser and Aeration Valve - Deliver ideal surface agitation and maximum oxygenation. Specifications: *170 GPH Water Pump

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