The 3M Model A2 Replacement Cartridge is designed for use in the 3M Recreational Vehicle/Marine Filtration Systems WV-B2, US-A1, and US-B1. NSF Tested and Certified. Part number 5613323
A2 Specifications:
- Reduces >95% of Chlorine
- Reduces Sediment, Dirt, Rust, Sand, and Silt down to 1 micron
- Built-In Bacteria Inhibitor
- Patented Carbon Block for Improved Absorption
- 2.5 GPM Flow Rate
- 7500 Gallon Filter Capacity
- 4 7/16" x 11 3/4" Dimensions
The Model A-2 should be changed every 1 year or 7500 Gallons depending on water quality and usage.