This Ultraviolet Water Sterilizer System is manufactured with axial flow reactors in 304 stainless steel and comes with 1/4" MNPT connections. It is great as an add-on to any under sink, bottle-less water cooler, reverse osmosis, or low flow filtration application. The hard glass germicidal lamps provide an economical way of treating water requiring a 99.99% reduction of bacteria, viruses, and protozoa. UV light is an effective, chemical-free way of treating your water.