Hidom High Efficiency Quiet Adjustable Multi-Speed Twin Outlet Aquarium Air Pump - 4W 4.0 Lpm High Efficiency Ultra Quiet Aquarium Energy Saving Air Pump Power: 4.0w 4.0 litres per minute - Adjustable Multi-Speed Twin Outlet Suitable for both tropical (freshwater) and saltwater (marine fish) Pumping air the quiet way