KleenWater Aqua-Pure AP217 Compatible Filter, AP200 Replacement O-Ring (1) KleenWater KW217 water filter replacement for 3M Aqua Pure AP217 KleenWater RG217 alternative o-ring for the Aqua-Pure AP200 under sink water filter system Impressive chlorine and chemical removal performance Provides dirt, rust, sediment, taste, odor and chlorine filtration Avoid an urgent situation with spare o-ring