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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. Safe in both fresh and salt water applications.UL-listed, CSA available.Epoxy-sealed, moisture-proof motor and electrical components ensure safe operationUnique mounting dystem--adjusts to any demand, bracket and suction cups expand mounting optionsAdjustable flow diffuser and aeration valveDelivers ideal surface agitation and maximum oxygenationModel 660R includes a prefilter sponge (replacements sold separately) to catch large debris in the water before it goes into the pump and reverse flow kit (doesn't provide surface agitation in reverse flow).