... reducer 3,Sturdy stainless steel Frame 4,High performace impeller, 5, HDPE float Aquaculture Aerator Speficitation: ModelHPPhaseVoltageCover AreaOxygen Transfer20/40/40H ... high durability4, High performace impeller, replaceable paddle,low maintence cost 5, HDPE float resist impact, acid-alkalinity and sun exposure, one ...