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. DESIGNED TO FIT: Bosch refrigerators that use the Sanitary Quick Change system. NSF/ANSI STANDARD 42 CERTIFIED: Reduces chlorine taste and odor ata flow rate of 0.5 gpm to a capacity of 300 gallons.*