The 3M Model A3 Replacement Cartridge is designed for use in the 3M Recreational Vehicle/Marine Filtration Systems WV-A3, WV-B2, and WV-B3. NSF Tested and Certified. Part number 5613416.
A3 Specifications:
The Model A-3 should be changed every 1 year or 15,000 Gallons depending on water quality and usage.