Attwood Compact Carbon Canister [99CC045-1S]Compact Carbon Canister Carbon canister systems utilize an engineered charcoal canister to reduce hydrocarbons entering the atmosphere. Other components of a carbon canister system are designed to ensure the tank fills to the proper level every time without spit back or well back. All Attwood carbon canister systems are designed to ensure liquid fuel or water does not reach the canister and are compatible with Jerry Can and marine nozzle refueling.