This has been discontinued by the manufacturer. The replacement aerator is available here:
Aquascape professional-grade aeration system is designed to help improve water circulation and increase oxygen throughout the pond. The Pond Aerator PRO system can also be used during the winter months where the bubbles created at the surface will keep a small hole open in the ice for oxygenation and the removal of possible harmful gases from the water.
Every process that happens in the pond is dependent on oxygen. This is especially important at night when plants are not converting CO2 into oxygen. Dissolved oxygen levels are also generally lower in warmer water temperatures. Pond aerators oxygenate your pond, helping all biological processes and creating a more stable environment, resulting in healthier fish and plants. Aeration is also very important during winter months in colder climates, as aeration helps to keep a small hole open in the surface of the pond to aid in degassing.
Features of the Pond Aerator Pro 60: