The only water filtration system designed specifically for hot water dispensers. System reduces chlorine taste and odor and is listed by NSF Standard 42 (Class 1) so you can be assured of its performance. Quick-connect plumbing fittings make installation a snap and the sanitary quick-change filter cartridge is replaced in only seconds! This system is ideal for use virtually anywhere filtered water is needed such as with ice makers and refrigerators. Sanitary Quick-Change Filter Cartridges make cartridge replacement fast & easy without contact with used filter material. Quick-Connect Push-In Fittings guarantees a quick easy installation. Valve-in-Head Design automatically shuts off water flow when filter cartridge is removed eliminating need for separate shut-off valve. Low Pressure Drop Filter design assures consistently flawless performance. Standard with all Series 1100 Instant Hot Water Dispensers & available to add on to the rest of the In-Sink-Erator Hot Water Dispenser lines. Reduces chlorine taste & odor for clean refreshing taste. NSF International Standard 42 (Class I) listing. 3-month recommended filter cartridge replacement. Comes with one F-201 Filter Cartridge. It is recommended that carbon-based filters like the F-201R or F-501R be changed within 12 months.