Outdoor Water Solutions AWS0011 12-Feet Galvanized 3-Legged Aeration System Windmill br click here to buy AWS0011 br New patent pending balcam technology that minimizes bearing fatigue with a 5-year warranty on the compressor br Windmill is manufactured out of high quality 18 gauge galvanized steel and made in the USA br High air output up to 45 cfm of air at a maximum of 30 psi larger check valves and upgraded 12 airline br Can aerate ponds up to 2-3 acres operates with low winds adds oxygen and prevents pond stratification preventing fish kills br New patent pending balcam technology that minimizes bearing fatigue with a 5-year warranty on the compressor