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The 3M Model B2 Replacement Cartridge is designed for use in the 3M Recreational Vehicle / Marine Filtration Systems WV-B2, US-A1, US-B1, WV-A3, and WV-B3. Part number 5613320
The 3M Model C is also NSF/ANSI Standard 53 Tested to reduce:
The Model B-2 should be changed every 1 year or 7500 Gallons depending on water quality and usage.