Faucet Shut Off Valve

shut off
A device used for stopping a supply or operation
stem the flow of; "shut off the gas when you leave for a vacation"
block off the passage through; "We shut off the valve"
The cessation of flow, supply, or activity
isolate or separate; "She was shut off from the friends"

faucet
a regulator for controlling the flow of a liquid from a reservoir
(Faucets) Every faucet consists of a spout and control or handles to deliver potable water to the kitchen, bath, bar, laundry room etc. They have an inner valve that controls the flow of water through the spout.
A device by which a flow of liquid or gas from a pipe or container can be controlled; a tap
A tap is a valve controlling release of liquids (faucet and spigot are the terms used in the U.S.) or gas. In the British Isles and most of the Commonwealth, the word is used for any everyday type of valve, particularly the fittings that control water supply to bathtubs and sinks. In the U.S.

valve
device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone
A membranous fold in a hollow organ or tubular structure, such as a blood vessel or the digestive tract, that maintains the flow of the contents in one direction by closing in response to any pressure from reverse flow
control consisting of a mechanical device for controlling the flow of a fluid
A device for controlling the passage of fluid through a pipe or duct, esp. an automatic device allowing movement in one direction only
A cylindrical mechanism in a brass instrument that, when depressed or turned, admits air into different sections of tubing and so extends the range of available notes
a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it