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Fuel evap canister. It stores fuel vapors coming from the tank and routes them into the intake system when the engine is running. It's a passive system and needs no maintenance other than checking for rotted hoses every once in a great while.
Dayum yours still has hoses on it. Mine's just sitting there with like 1 or 2 hoses hooked up. The PO took them all out so I've got no clue how to put it all back together. Whatever. Who needs emissions anyway?