Plastic Barrel Spanner A plastic, two handled spanner for use with 4" wide neck wine fermenters and King Keg barrels. This may be either black or white. £2.49 Sorry, this item is currently out of stock. We are ordering weekly, but do not know when it will be available. A plastic, two handled spanner for use with wide neck wine fermenters and brewing barrels to make it easy to remove the 4" cap.It is not suitable for use with standard 2" necked barrels.