Stop Cork Small 1/2

A stopcock is a form of valve used to control the flow of a liquid or gas. The term is not precise and is applied to many different types of valve. The only consistent attribute is that the valve is designed to completely stop the flow when closed fully.
Your internal stopcock turns off the water from the supply pipe as it enters your property. This will shut off all the water in your property, meaning repairs can be made to pipes or disasters can be averted.