Evolution Aqua Evo UV Sterilizers are offer less head than comparable UV sterilizers on the market, resulting in higher flow rates and greater performance. These world-class UV sterilizers feature computer modeled deflectors, which help to ensure that the flow of water has a maximum exposure to the UV light. Electronic ballast uses less electricity. Integrated UV lamp life indicator* and power light. UV stabilized PE outer casing which has a higher reflective index than stainless steel. Unique design provides less head loss than other manufacturer’s models, thus saving on operating costs. Thermal safety protection means that the unit will switch off before it overheats. Can be mounted horizontally or vertically. 2-inch ports on both models