Brewhelm

The Brewhelm can be used to add the Brewhelm visual effect.

Source
The Brewhelm is sold for from
 * at the Alliance Brewfest grounds outside Ironforge.
 * in the Stonefire Tavern, Ironforge.
 * at the Horde Brewfest grounds outside Orgrimmar.
 * in the Valley of Spirits, Orgrimmar.