stopcock
/ˈstɑpˌkɑk/
noun
- A valve used to control the flow of a liquid or gas through a pipe, often by turning a handle.
- She checked the stopcock in the basement to make sure the outdoor faucet wouldn't freeze.
- The plumber turned the stopcock to shut off the water supply before fixing the leak.
- In an emergency, you can use the stopcock to stop the gas flow to the stove.
Synonyms