The Emperor Aquatics Smart Lite UV Sterilizers are designed for aquarium owners and pond keepers who appreciate quality and performance but are restricted with space. The Emperor Aquatics Smart UV Lite features a space saving 2" diameter body constructed of UV resistant plastic. All models are watertight, corrosion resistant, and designed for safe operation in outdoor environments. For aquarium or pond use-For aquariums up to 200 gallons. The 200 gallons rating assumes the unit is being used as a clarifier (algae) and sterilizer.-For ponds up to 3,000 gallons40 watt T5 UV lampIn lineConnections: 2" slip inlet/ 2" slip outletA pump is a required. The required flow rates:-Algae: 983 gph maximum, 589 gph minimum-Protozoa: 327 gph maximum, 196 gph minimumDimensions: 44.75" X 2.5"Accessories:2" Mounting Bracket for Emperor Aquatics Smart Lite UV Sterilizers1 inch Bushing-Hose Barb Kit for 2 inch inlet/outlet (pair)3/4 inch Bushing-Hose Barb Kit for 2 inch inlet/outlet (pair)