Spile

n.
  1. A small plug or wooden pin, used to stop a vent, as in a cask.
  2. A small tube or spout inserted in a tree for conducting sap, as from a sugar maple.
  3. A large stake driven into the ground as a support for some superstructure; a pile.
  4. Spile hole ,
    a small air hole in a cask; a vent.

v. t.
  1. To supply with a spile or a spigot; to make a small vent in, as a cask.