Sunsun 18W UV Ultraviolet Sterilizer Light Clarifier Aquarium Pond Koi Lamp Bulb Filter 18 Watts, 13" length AC 110-120V / 60Hz (USA, Canada, Japan) Suitable for ponds up to2000 gallons or 75 gallons aquarium Inlet/outlet size: 3/4", 1" Max Flow Rate:600GPH