Atman external canister filter AT3338 1 Quiet,energy efficient and powerful 2 Simple setup and easy install 3 superior filter Atman external canister filter AT3338 1 Quiet,energy efficient and powerful 2 With pneumatic water-sucking function for quick and easy operation. 3 Simple set-up and easy installation 4 Distinctively a superior filtering system 5 Parameters(220V~240V 50Hz) 6 Suitable for circulating system outside the tank, that would not share space within the tank.