Polaris UVA-12C Whole House UV Ultraviolet Water Sterilization System – OPEN BOX. Please Note – the quartz sleeve is not included – the replacement item number is QS39. Compact units with 304 stainless steel reactor chamber, polished for laboratory and medical use, require minimal space. Microorganisms are inactivated within seconds; eliminates the need for long retention times or retention tanks. High output low pressure mercury vapor lamps with high isolation pin. Little change in water temperature even after prolonged periods of no water flow. Open end high quality quartz sleeve and stainless steel gland units. Automatic, unattended and user friendly operation. Fast and simple installation with three connections (two water and one electrical). UV imparts no change in taste, odor, pH or conductivity. Please See Photos – Actual items photos are always included in every listing, never stock photos. Packages may have retail inventory stickers or packaging may be distressed. For Open Box or Used items please read the item conditions under Item Specifics.