Sunsun CUV-136 UV Sterilizer 36W Light Lamp Clarifier Pond Reef Fish Aquarium 36 Watts, 20" length AC 110-120V / 60Hz (USA, Canada, Japan) Suitable for ponds up to4000 gallons or 180 gallons aquarium Inlet/outlet size: 3/4", 1", 1-1/4" & 1-1/2" Max Flow Rate:600GPH