The gate key is a miscellaneous item in Fallout: Brotherhood of Steel.
The gate key could refer to either of two gate keys found during the Defeat Raiders quest and a key to unlock the gate between holding cells at the Docks of Los
- The first is obtained in the raider camp located in the Carbon Railyard and is used to progress to the Carbon Mill Exterior.
- The second is obtained from looting the raiders in the vicinity of the gate leading from the Mill exterior to the Mill Parking Lot and is used to open that gate.
- Docks of Los, held by a ghoul east of the holding pens.