At 20ft.H with 73in. dia. blades, this Outdoor Water Solutions Windmill Aeration System is one of the largest pond-aerating windmills available. Patent-pending BalCam Technology significantly increases the amount of air a single diaphragm can produce. Comes with everything needed to ensure a healthy pond, including an air stone diffuser (Item# 339893) and foot valve, 100ft. of regular airline, 50ft. of weighted airline, a hose connector pack, tower hinges and tailfin.