75 watt High Pressure Stainless Steel UV Sterilizer Clarifier Pond Koi STU-75W AC100-120V 50/60HZ Input 75w UV Bulb, Through Flow Sterilization at 6600 GPH Good for up to 20,000 Gallons Pond Inlet & Outlet Adapter 0.75", 1", 1.25", 1.5" Dimension 39"x11"x5"