United States liquid unit - a liquid unit officially adopted in the United States Customary System

quart - a United States liquid unit equal to 32 fluid ounces; four quarts equal one gallon

bbl, barrel - any of various units of capacity; "a barrel of beer is 31 gallons and a barrel of oil is 42 gallons"

British capacity unit, Imperial capacity unit - a unit of measure for capacity officially adopted in the British Imperial System; British units are both dry and wet

bbl, barrel - any of various units of capacity; "a barrel of beer is 31 gallons and a barrel of oil is 42 gallons"

quart - a British imperial capacity measure (liquid or dry) equal to 2 pints or 1.136 liters

bushel - a British imperial capacity measure (liquid or dry) equal to 4 pecks

firkin - a British unit of capacity equal to 9 imperial gallons