Answer:

bung

Answer	Crossword Clue
BUNG	Cask's stopper
BUNG	Cask stopper
BUNG	Wine barrel stopper

BUNG	Keg tap
BUNG	Cask stopper.
BUNG	Large cork for stopping the hole in a cask.
BUNG	Cork.
BUNG	Stopper for a keg.
BUNG	Stopper.
BUNG	Cork for a beer keg.
BUNG	Barrel cork.

BUNG	Cork for a cask.
BUNG	Beer-keg stopper
BUNG	Keg stopper