Manufacturer Part Number: 28229 Replacement Color Changing Activated Carbon Cartridge (2 pack) for Aerosolv® Dual-Compliant System. The colormetric carbon cartridge includes a check valve in the carbon cartridge to help prevent passive gas release. Carbon cartridge filters out odors and potentially harmful VOCs. Colormetric indicator tells you exactly when to change the filter/cartridge. Designed to comply with California s vapor emission regulations. Cartridge life is 3 months or 750 cans; more frequent change-outs may be necessary based on use. Key Benefits Activated color-changing carbon cartridge filter replacement Two pack Specifications Model No28229UPC Code697841108820International Model No.28229TypeCarbon FiltersNet Weight lbs3.4Net Weight kg1.5