Includes WaterSentry 1,500-gallon capacity filter 51299C filter is tested and certified to NSF 42 and 53 for the reduction of lead, Class 1 particulate and chlorine taste and odor Filter should be replaced every 1,500 gallons or 1 year after installation; replace sooner if unit is located in a high-traffic area in places such as schools and airports Vandal-resistant enclosure made from 20-gauge stainless steel to protect filter and discourage tampering; Torx bit included for added security Versatile mounting near accessible water line; box includes conduit punchouts on sides and bottom and an open back for thru-wall plumbing; vandal-resistant conduit not provided; Universal box works with Elkay and non-Elkay units to turn any non-filtered cooler or fountain into a filtered unit; LED filter status monitor and audio alert indicate when filter replacement is needed Universal box works with Elkay and non-Elkay units to turn any non-filtered cooler or fountain into a filtered unit