Tier1 Replacement for Bosch 640565, Whirlpool WHKF-R-PLUS, EVOLFLTR10, CS-52, AP3961137 Refrigerator Water Filter DESIGNED TO FIT: Bosch refrigerators that use the Sanitary Quick Change system NSF 42 CERTIFIED: Each Tier1 refrigerator filter is tested and certified for materials and structural integrity requirements. HIGH EFFICIENCY FILTRATION: Reduces Chlorine Taste & Odor, Rust and Corrosion, Sand Sediment, Silt, and Turbidity for 300 gallons or 6 months, depending on water usage and quality. REPLACEMENT MODEL: This is a replacement comparable part to CS-52, 640565, EVOLFLTR10, CS-51, AP3961137, EFF-6026A, WSB-1, WSQ-1, SGF-BO50, EAP8729485, OCS CS52, and CS-451. 100% TIER1 NO WORRIES GUARANTEE: We stand behind the quality of filtration and overall performance of our Tier1 filters! Chlorine Taste and Odor Rust and Corrosion Sand Sediment Silt Turbidity