a small peg or plug for stopping the vent of a cask.

a peg or plug for stopping the passage of liquid in a faucet or cock.

a faucet or cock for controlling the flow of liquid from a pipe or the like.

the end of a pipe that enters the enlarged end of another pipe to form a joint.

noun

faucet , nozzle , outlet , plug , spile , spout , stopper , stopple , tap , valve , vent