rundlet

In England, and subsequently Great Britain and its colonies, 18th century–19th century, a unit of capacity used for wine, honey and other commodities, before 1824 = 1/14 tun = 18 wine gallons, and after 1824 = 15 imperial gallons. Also spelled runlet.

“Rundlet” sometimes simply meant a small cask of indeterminate capacity.

From 15th century¹ – 17th centuries, = 18½ gallons.

Connor, page 189. note 6

1. 1 Richard III chap. 13 (1483-1484)