Lifegard Aquatics Quiet One Pro Model 5000 & 6000 Impeller (R440822) Replacement Impeller for the Lifegard Aquatics Quiet One Pro Model 5000 Aquarium Pump, Quiet One Pro Model 6000 Aquarium Pump, Quiet One Pro Model 5000 Pond Pump & Quiet One Pro Model 6000 Pond Pump. Lifegard Aquatics Part# R440822. It will NOT work with any of the the Quiet One Original Series Pumps.