Key Features 2 way aquarium air pump Double outlet Comes with free replacement membrane Suitable for 0-250L aquariums 240L/hr flow rate The Superfish Aquarium Air-Flow 2 Way Air Pump is designed to keep your aquarium oxygen-rich. This particular unit includes one outlet with a flow rate of 240 Litres per Hour. This unit features adjustable flow rates. The air pump must be used externally above the tank. Each pump also comes with a free replacement membrane to ensure longer usage. Specification Suitable for: up to 250 Litre tanks Power: 4 Watt Flow Rate: 240 Litres per Hour