Convert from fifth to bucket [UK]

Unit Definition (fifth)
The fifth is a traditional U.S. unit of liquid volume equal to 4/5 quart, which is the same as 1/5 gallon. The fifth contains exactly 46.2 cubic inches, or about 757.084 milliliters. This unit is an American version of the traditional bottle.

Unit Definition (bucket [UK])
The bucket [UK] is a unit of volume, generally informal. In Britain, a bucket is often understood to be 4 gallons, or 18.182 liters based on the British Imperial gallon.