This Lifegard Aquatics Quiet One 4000 Pond and Water Garden Pump is ultra quiet and energy-efficient. It generates more power using less energy and includes a sponge plus fountain kit with spray attachments. The garden pump has internal recirculation which keeps it from overheating and ejects debris. Impeller technology provides combined rotors, improved shaft materials, and corrosion-resistant bearings. EZ-access covers make maintaining the rotor, shaft, and removable impellers a breeze. Cooling chambers provide air-cooling during dry use and water-cooling in wet applications.