Features Venturi aeration nozzle supplied to create bubbles and increase oxygen levels of returning water. No air pump needed in principle. Venturi effect: As water is pumped back into the tank, it can also be aerated by a venturi pipe. This accelerates the water flow and draws in a stream of air from above the surface. Stainless steel bearing, silent running for years Comes complete with 2 downpipes giving you the option to extend the filtration an extra 29cm to the bottom of your tank. Complete with hose and suction cups for fixing to the side of the aquariums Specification 1000L/H Aquarium Powerhead Suitable for fresh or salt water aquarium tanks upto 180 Litres Power consumption: 20w Max Output: 1000L/h Height Max: 1.5m Dimensions: 100 x 65 x 115 mm Voltage: 220-240v Comply with: CE, ROHS & TUV. UK 3 pin plug with 1.4m of cable 12 Months warranty