stopcock
noun
stop·cock ˈstäp-ˌkäk 
: a cock for stopping or regulating flow (as through a pipe)
Synonyms
- cock
- faucet
- gate
- spigot
- tap
- valve
See all Synonyms & Antonyms 
Example Sentences
a mechanical engineer who designs industrial valves and stopcocks
Recent Examples on the Web Levers, stopcocks, switches and buttons sent decisions back out. 
The Economist, 18 Dec. 2019
The Economist, 18 Dec. 2019 Word History
First Known Use
1584, in the meaning defined above
stopcocks
noun
as in valves
a fixture for controlling the flow of a liquid a mechanical engineer who designs industrial valves and stopcocks Synonyms & Similar Words
Relevance
- valves
- taps
- faucets
- spigots
- cocks
- hydrants
- gates
- petcocks
- spouts