- The diameter or width of the head from the outside lip of the chimb is 12 1/2 inches. [red arrows]
- The width of the firkin at its widest point at its belly is 16-17 inches. [green arrows]
- The circumference of the firkin at its widest point at its belly is 49 inches. [green arrows]
- The length of the firkin from chimb to chimb is 19 1/4 inches. [blue arrows]
- The length of the firkin from back chimb [blue arrows] to the protruding end of the tap [black arrow] is 23 3/4 inches. An inserted cask widge provides a similar measurement. This is a critical measurement when installing a firkin in a small space, such as underneath a bartop.
- The diameter of the keystone bung is 1 3/8 inches. [black arrow]
- The diameter of the shive bung is 2 inches. [yellow arrow]
This post is one in a series on Cask Ale: Fobbing at the Tut.