Convert from drum [metric, petroleum] to gill [UK]

Unit Definition (drum [metric, petroleum])
The drum [metric, petroleum] is a unit of volume sometimes used in the oil trade. In the metric world, drums of 200 liters, 205 liters, and 208 liters are in use as substitutes for the traditional size.

Unit Definition (gill [UK])
The gill [UK] is a traditional unit of volume for liquids, especially wine and other alcoholic beverages. The gill is 1/4 pint. In the British Imperial system, the gill equals 5 fluid ounces, 8.670 cubic inches, or about 137.7 milliliters. The unit is pronounced "jill", with a soft "g" sound. Its name comes a Latin word gillo for a small wine vessel.