Kasco pond aerators (also called high oxygen transfer units) are designed to withstand the rigors of commercial aquaculture operations,industrial applications, and municipal waste water plants. With more vertical-pump-type aerators in use in North America than any other manufacturer, Kasco is the clear market leader in products proven to deliver outstanding performance and reliability. Kasco pond aerators dramatically agitate high volumes of water at the surface to maximize exposure of water to the air for valuable gas exchange, greatly improving your pond or lake aeration. Features: Efficient / Low Power Use: Highest efficiency design for low power consumption versus competing units. Reduces operating costs over the entire life of the unit; Rugged Motor: Environmentally friendly design with a hard-face internal mechanical seal and external lip seal for protection against leaks. Long-life top and bottom ball bearings. Flood oil lubricated for excellent heat dissipation; Corrosion Resistant: Superior dependability in salt-water or other corrosive environments. All external metal motor, float, and hardware components are of stainless steel composition and protected by a sacrificial zinc anode; Low Maintenance: Clean the motor housing once or twice per year and replacing the sacrificial zinc anode when visibly corroded; Fully Tested: ETL listed to stringent UL and CSA Safety Standards; Ships Easily: Via UPS; Dependable: Backed by a two-year warranty (three-year warranty for the 2, 3, and 5HP)