Available for both 3/8″ and 1/2″ Airline sizes. Windmills and EL2 Electric Aerators use 3/8″ Airline. HD Electric Aerators use 1/2″ Airline. A Foot Valve is used in conjunction with Koenders Airstone Diffuser to prevent the back flow of water.
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3rd party study confirms that Koenders windmills have the best performance ratings in the industry!Read more About it