Gallon

A unit of volume. A U.S. gallon contains 231 cubic inches, 0.133 cubic feet, or 3.785 liters. One U.S. gallon of water weighs 8.3 lbs.
A unit that is now almost entirely out of date. It is equivalent to 3.785 liters.


Source: Corrosion-Doctors.org

Wikipedia:  https://en.wikipedia.org/wiki/Gallon