This carbon canister filter can be used to replace old filters that are no longer functioning properly. Carbon canister filters need to be replaced regularly in order to ensure outdoor power equipment runs efficiently. Filters are essential for keeping dirt, debris, and harmful materials from ruining an engine. Without carbon canisters, outdoor power equipment can experience decreased fuel efficiency whilst also contaminating the air with more pollutants from the engine. While an engine is running and even after it has been turned off, fuel vapors rise from the fuel tank and pollute the air. Carbon canisters are essential for trapping these vapors and preventing them from being released. Without a clean, well-functioning filter, carbon canisters cannot work efficiently.This carbon canister filter is a genuine replacement part sourced directly from the manufacturer. This replacement carbon canister filter fits various different models of MTD, Cub Cadet, Yardman, Husky, and Troy-Bilt outdoor power equipment such as lawn mowers, log splitters, and trimmers. Please note this cover plate is sold individually.