Powder Coated 20 ft Windmill Aeration System Feeder (1) Dual Disc Diffuser The base on the (1) Dual Disc Diffuser The charge control system allows for self monitoring of voltage and battery power The Wind Driven Aeration System offers:New “BalCam II” technology minimizes bearing fatigue with new Stainless Steel componentsPatent pending new designFast & Easy AssemblyManufactured with high quality 18 gauge galvanized steelNewly redesigned blades and front dome assembly for better air flowSelf governing head to protect the unit in high windsNew secure locking mechanism that attaches the windmill head to shaftLarger check valves and upgraded ½” airline to handle the increased air that is producedHigh Air Output – 3 but they are also essential pieces of equipment for your pond