Brand Compatibility: Culligan IC-EZ-4, US-EZ-4, RV-EZ-4 | Brand Name: Culligan | Capacity: 500 gal. | Filtration Method: Carbon | Fitting Style: Twist and Lock Design | Number in Package: 1 pk | Packaging Type: Boxed | Placement: Whole House | Reduces Chemicals: No | Reduces Chlorine Taste and Odor: Yes | Reduces Lead: Yes | Reduces Microorganisms: No | Reduces Pharmaceuticals: No | Reduces Sediment: Yes | Reduces Cyst: Yes The RC-EZ-4 Premium filter cartridge provides 500 gallons of refreshing drinking water for your EZ change system. | The perfect solution for: Atrazine, Bad Taste & Odor, Chloramine Taste & Odor, Chlorine, Cysts, Lead, Lindane, Mercury, MTBE, Nominal Particulate Class I, Perfluorinated Chemicals (PFCs: PFOA & PFOS), Sediment, Turbidity, Volatile Organic Chemicals | Easy Istallation | Twist-on, twist-off mechanism. | Quick-connect fittings. | 1/4" Connection | Fits Culligan Models: IC-EZ-1 (Ace Number: 4294039) , IC-EZ-3 (Ace Number: 4294047), IC-EZ-4, US-EZ-1 (Ace Number: 4294096), US-EZ-3 (Ace Number: 4294104), US-EZ-4 (Ace Number: 4294138), and RV-EZ-3