Great as an add on to any under sink bottleless water cooler reverse Osmosis or low flow filtration application. Crystal Quest 1 GPM Ultraviolet Water Sterilizer System manufactured with axial flow reactors in 304 stainless steel and come with with 1/4 MNPT connections. The hard glass germicidal lamps provide an economical way of treating water requiring a 99.99% reduction of bacteria and virus and protozoa. This process is accomplished without adding any harmful chemicals to your drinking water. Crystal Quest Ultraviolet Water Sterilizer System is the most ecological way of treating your water and all for just pennies a day. Dimension: 2.5 x 11. Inlet/Outlet Port Size: 1/4 MNPT. Flow rate (GPM): 1. Electrical: 110-130v/50-60 Hz. Maximum Operating pressure: 85 psi. Lamp life: 9000 hrs ( approx. 1 year of use). Audible Lamp Failure: Yes. Led power-on indicator: Yes.