Quiet One Model 4000 Aquarium Pump, Rainbow Lifegard. 1017 gph max flow at 0 head feet. Uses 50 watts. Max head 10.0 feet. 1 inch MPT on inlet & outlet. Extremely quiet operation. Noise level less than 45 decibels. Ease of service through simple snap on/off molded covers and removable magnetic drive impellers. Safe for salt or fresh water use. Patented Uni-Direction impeller eliminates need for noisy mechanical device. High quality ceramic bearings help ensure quiet operation and long life. Small footprint with energy-efficient motor and high flow rates.